Alternator dummy light DanStew Preowned Merkin salesman Staff Member Nov 7, 2011 · W/R is the one from the "dummy light" Its what controls the charging, not actually just a dummy light thing. The (D+) terminal on the alternator MUST connect to a functioning warning light in the instrument cluster. Next run a wire from a switch ignition source like the radio to the terminal labeled I. Here’s how to wire it: Connect the main power terminal on the alternator to the battery. The next morning the car didn't start again. Feb 18, 2022 · Check inner fender well harness on driver's side. Feb 3, 2019 · Sounds like the alternator is not getting reference voltage when the ignition switch is in the "RUN" position. Jul 8, 2007 · The light does not function as the light did in the past on older vehicles. Dec 18, 2023 · I’m aware, they complete the charging system and if they’re not working the batteries will not charge, I would like to completely remove the dummy lights & switch the cluster out to something more modern with LED lights, does anyone have the original m1008 CUCV alternator dummy light wiring Jul 9, 2015 · Posted: Sun Jun 21, 2015 8:20 pm Post subject: Alternator Dummy Light with Hotrod Wiring Nov 18, 2012 · This is the wire that feeds the dummy light in the dash. Some use a transistor to stop the. If there is no charging then that side goes to ground and the light comes on. Mar 27, 2021 · I want to know which of the 4 wires on the CS130 Alternator (PLFS) to use with the stock voltmeter gauge (Brown wire from bulkhead). May 29, 2020 · The light gets power from the "ignition" side of the harness causing the alternator to charge. Jul 16, 2021 · Sometimes the alternator will generate too much electricity and this can lead to it overcharging the battery. Jul 7, 2010 · If you are not getting voltage out of an alternator, no light before start up or during running, the exciter wire is exciting and all the other wires are correct. May 15, 2014 · Use a voltmeter inside the vehicle as your reference instead of a dummy light or ammeter. It looks like when the alt fails, D+ can go to ground and light the Forum Index-> Beetle - Late Model/Super - 1968-up-> Alternator Dummy Light Wiring : View original topic: Alternator Dummy Light Wiring: laug6615: Sat Mar 28, 2009 1: Jun 26, 2018 · The alternator dummy light side of things is easy enough to wire but again, without full understanding how the bulb check works I can't determine if it is necessary for proper voltage regulation. I changed the cluster lights to LED but kept the alternator light original. Apr 6, 2023 · Ultimately, if the original factory wiring is modified correctly to work with an internaly regulated alternator, then the alternator 2-wire plug will have +12 volts on terminal #1 ONLY when the key is "on". Check page EL-23 in the factory service manual. This is a signal, produced by the alternator, and in factory applications, it was reported to the ECM or the GBCM for a few reasons. Also, with the alternator in the vehicle and vehicle running, if I test the voltage coming off the alternator at the charge bolt with a voltmeter it’s 14 volts (positive lead on charge bolt, common lead ground to frame). Feb 20, 2014 · This leads me to believe the brown single wire to the alternator telling it to "energize" and also connected to (via the basic universal Haynes wiring diagram for the full spectrum of gmt400 trucks) the battery dummy light is not receiving signal when the ignition is in the on position. Jul 1, 2022 · I want to add a warning light for low/no battery charging. Sep 20, 2020 · The PA Performance alternator can be used with with or without the "1G to 3G conversion kit 462802C". Change everything from the charge harness, eld, and fuse. Jan 4, 2013 · Firstly the battery light came on and Took car to dealer they allegedly changed the alternator One week later the battery light came on again and vehicle would not start, engine cran … read more Pete Aug 17, 2019 · 12 volts. To clarify, it is a '72 standard with a 1600DP and an alt. After about a day or two the battery died. Feeds through the light which is not grounded and continues to the 1 terminal on the alternator. I’m guessing getting back fed from battery through voltmeter back to alternator. I have a 454 bbc marinised motor in my boat. When you turn on the key, 12 volts is supplied to the alternator's field windings through the idiot light. The PO made a real mess of the wiring so I replaced everything with a universal harness from Speedway Motors. 3 so i researched testing alternators and i cant get any more then 12. May 31, 2023 · my tractor is not charging when i check the battery with a multimeter its around 12. 1991 Eagle Talon N/T. It would be on when I started the car after a long time with the car off. Also I have no idea how to run Jul 5, 2011 · The dash has a resister in parallel with the light, I assume so, the alt will keep charging even if the bulb burns out. If the output from the alternator fails that "+" in the above diagram turns to a "-" and the light will come on. This will also cause the dummy light to illuminate (on dummy light cars) when the engine isn't running. Jun 25, 2015 · If the other side of the dummy light was connected to negative at circuit ground potential it would stay lit all the time. I purchased the boat from the previous owner and the alternator was broken so I replaced it with a standard gm 3 pin alternator. OBD2 Consult port. You need this if you don't have the "idiot" light because it has a built in resistor. I started loosing power to everything, but made it home. In a normal system when the car is running and the alternator and voltage regulator are working fine, this wire has 12 volts on it. Your light bulb should ba a 194 or one of equal wattage. (Yes, I disconnected the battery first!) Howsomever, after putting it all back together, the alternator light is on constantly. Internally regulated alternators have a "1" and a "2". 1 is your dummy light/excitation wire. Then I would suggest you spend the $4. Apr 8, 2013 · The red alternator light on the dash will not come one. Ignition comes on closes switch dummy light turns on, start car then alternator starts to charge and transistors in alternator switch from ground to power and light goes off. The use of the 200A fuse will effectively bypass the ammeter. The reason for this is simply because the vehicle isn't worth the cost of a direct replacement alt, and I Jun 29, 2020 · 1967 - 1972 F-100 & Larger F-Series Trucks - 3g alternator upgrade - Hi all, I recently picked up a 72 F100 and have been working on getting it roadworthy. And there’s an SCR hanging off that connection too. * If i remove the negative of the battery while* car is running, she Jan 23, 2008 · The Alternator would not charge! I simulated a dummy light with a resistor and the alternator started charging. NOW though, that light is controlled by the PCM, or some other brain in the truck. I nursed it home just the same, but alas my alternator is not charging. I replaced the alternator with a one wire, 100 amp alternator. I have a 2008 Patriot 2. Dec 9, 2016 · X2 with Poncho. Sep 20, 2009 · There should be just one wire (blue) from the (D+) connector on the alternator to the button on the bottom of the normal indicator light in the dash. Dec 19, 2005 · Blue and the yellow are alternator dummy light and power steering switch I think. Decided to get a denso alternator and the light went away. Feb 10, 2020 · To test it, take the belt off so the alternator doesn't turn when you start it. I replace the alternator on my 1972 Jeep Commando with a GM CS130. My schematic shows the brown wire goes from the voltage regulator to the fuseblock where it splits off and goes to the gen light but also to a harness for the ignition switch. Nov 6, 2023 · Take ignition power to an ungrounded (2 wire) incandescent light bulb. Current flows one way and not the other way - thus the alternator is not getting the reference voltage. Where is the best place to tap in to accomplish this? If off the voltage regulator, which wire (color)? Thanks in advance for any help. 6, and while driving it varies between 13. I probably wouldn't wire directly to D+ without a fuse or resister. 5 and when i start it it drops to 12. I understand the Alt will not work until that circuit is complete. Technical Understanding Alternator Wiring The H A M B. Everything seems to be fine aside from the dummy battery light being on (once I hit the "info reset" button to get rid of the "service electrical system" DIC warning). Back flow of power. I replaced the alternator, still didn't start. That wire interacts with a lot of other circuits, too. If it's a newer 1 wire alternator and you want the benefit of down steam voltage sensing. <G> Feb 23, 2018 · If you have a test light put the clip on the pos side of battery and probe the I circuit at alternator. The dash light is also wired from the (D+) (Blue) to ignition terminal #15 on the coil, which in turn is connected to the positive (+) post on the battery (Black). Quantity in Basket: none: Sep 24, 2023 · Wiring this in will turn your dummy light on when less than 11 volts is being put out by the alternator. conversion with an internal regulator. The dummy light, Idiot light . just going through my car and thought id share what the dummy light does and how to hook it upit excites the alternator when the key is turned ON and is resi Necessity for the Alternator Warning Light It is absolutely essential that the (D+) terminal on the alternator be connected to a functioning "Alt" warning light in the instrument cluster. I have a stock 3 wire alternator that is externally regulated. You could probably use that resister value instead of a light between the battery and D+. The dummy light has never worked and I'm not quite sure the alternator is charging. Speedway Motors also sells the harness with diode for about 18 bucks, another way to go if you like, hope this helps, Trev. If the sense wire gets straight 12 volts, when the key is switched off it will backfeed through the ignition switch to the coil wire and provide Dec 28, 2020 · Problem is as soon as hook battery up to cable(key off) with a test light the alternator has juice running to it. Which is a switch back to battery positive. there was no dummy light hooked up so i bought one Jan 13, 2006 · Electrical Systems/Wiring - 1G alternator and regulator wiring - I am trying to convert a vehicle that previously had a single wire alternator (no dummy light, no ammeter) to an externally regulated Ford 1G alt. 3 when running. My dash wiring is cut-up enough that I would like to rewire the idiot light separately. Run the other wire of the light bulb to the unused stator terminal on the 1G. Swap out and test the battery. The dash sends current through the light to the alternator to power it up. Terminal #2 simply senses the system voltage to tell the alternator when to start charging. Aug 31, 2012 · Alternator dummy light. The diagram above shows a circuit directly from the OP switch to the alternator "field" which in the case of the 10SI would be regulator terminal #1. On the left is the "Gen/Alt" light, and on the right is the "Oil" light. I got around to putting one in because I wanted a warning light, my gauge cluster is LED so I couldn't wire one in there. I ran mine with out a light for a 2-3 year period without any ill effects. Dummy light was easy and useful. allows the alt to energize and start producing juice. You can bypass this with running the green red to the accessory wire with a 560ohm resistor and even if your bulb is burnt out for your alt dummy light it will still charge. Jan 8, 2023 · Alternator Wiring With And Without The Dash Warning Light. For those of you using Neil's 12 volt wiring diagram to do your conversions, his reference to a "side marker" light means an indicator equivalent to bulb type #194, which has the right electrical characteristics to act as an idiot light and to excite the alternator. Feb 2, 2015 · Both of the alternator dummy lights on my dash use to light up when I first started the truck. May 14, 2020 · At the same time, added the alternator, headlight, under dash harness and even replaced the cluster harness for the factory tach. 3 v6 with 76k miles. Still didn't start. Aug 31, 2012. When you turn on the ignition both of these lights should be illuminated; both should go out when the engine is Sep 22, 2024 · Earlier GM charging systems like your midyear Corvette, had an additional two-prong connector on the back of the alternator which included an exciter wire from an external voltage regulator to tell the alternator to start charging, how much charge the system needed, and another terminal to feed the amp gauge or idiot light in the dash. Since the other side of the bulb has 12 volts from the dash wiring, this makes the light go out. Perhaps the GEM? Either way, sounds like you need a new alternator. FWD · Manual; Showcar Build. I originally had a PA Performance alternator and suddenly the battery dummy light showed up sporadically over the last week. . Will this work, or do I need something a littler more heavy duty? Wire size shouldn't matter, but lamp wattage might. Taiss LED Indicator Pilot Dash Light (Battery/Alternator Warning) Red, 1/2"(12mm)12V LED Metal Signal Indicator Light. It also controlled the dash light, IF the light was not used for the Exciter circuit itself. Mar 11, 2014 · T, you'll be just fine with or with out a light. The Actual Correct Way To Wire High Output Alternator On 94 Silverado K1500 Gm Truck Club Forum May 17, 2010 · On the #2 post, the plug to the right, I have going to the battery post on the alternator, but I have a switch between it to turn it on and off. The wires I can see look like crap so I would think that if the charging system appears to be operating normally then the battery light has found a ground due to either corrosion or broken shielding somewhere before the relay that would turn the light on due to failure or the relay itself for the light may be shorted Oct 26, 2012 · Hoping for some help here. 0 CRD and the battery light came on and stayed on whilst driving the other day. Wiring for Oil pressure, alternator dummy light, reverse lights, reverse lockout and skip-shifts lockout. 9. Charging System Tests. Dec 30, 2016 · I'll be running a 63 amp GM alternator and I picked up one of these today to use as an alternator idiot light, but the wires seem awful small. I don't notice any other issues, either. When the alternator is not charging, it will ground the light bulb, and the bulb will glow. May 12, 2010 · An idiot light for your alt is a great idea. After checking all connections to alternator and battery and found them to be fine I concluded it must be a faulty alternator. but when the truck is running my volt meter shows in the green (after a few minutes of running and the belt stops slipping lol) Most vehicles I've worked on in Feb 18, 2014 · Battery and alternator were tested and passed at Autozone. Technical 3g Alternator No Charge Light Wiring The H A M B. May 4, 2011 · I ask this because I'm running a 1-wire alternator, but my dummy "gen" light works from the #1 terminal. However, if you have a 2 or 3 wire alt and don't wire in the idiot light correctly, your alt won't work correctly. battery + ===== LAMP ===== alternator output + This done using a wire that is not attached to the rest of the cars electrical system. Connect pin 1 (dummy light) to the 194 bulb and a diode. Jan 1, 2012 · Gauge looked good, no dummy light, voltages measuread at battery, alternator, and underhood fuse panel averaged around 14. Attached Images Dec 19, 2017 · Terminal #1 on a GM10si alternator needs a SWITCHED POWER SOURCE that only has power in the RUN key position. When the car is cranked the alternator dummy light comes on and the voltmeter slowly climbs to 16+ volts. Double check all your ground wires. If you can use fresh wire from the resistor to the alternator plug, that would be best. One of the two wires on a two wire light needs to run to a switched( you only want the light to come on with the ignition switch) voltage source. Specifically made for one wire alternators to turn off the dummy light when charging. If the light is either burned out or not installed, the alternator will appear to be dead. 55 62 Vintage Alternator Generator With Tach Drive Nd. Mar 2, 2009 · The brown wire for the indicator light coming off the alternator is grounded when the alternator is not charging and provides +12V when it is charging. with car off my battery reads 13. (wire 2) Alternator terminal 2 to alternator stud. If you see your Liberty’s battery light turn on while driving, it’s likely the alternator is no longer providing enough voltage to power the various electrical systems and charge the battery simultaneously. I have a 12v indicator light, which has yet to work, hooked up to the number 1 post and is ground to the body. If light comes on then start the truck with the probe still in the alternator and see if it charges. When the car starts the alternator produces +12v (not 100% accurate actually all voltage rises when charging) if working. I swapped the alternator anyway and it still doesn't charge the battery. Apr 23, 2006 · Hey all, just doing a CS130 conversion using an alternator for an 88 Firenza. Now, my car won't charge. Apr 6, 2023 · If your running a modern 1 wire alternator you can hook up the sensing wire and NOT the exciter wire. Perfect plug and play install. There is a white wire on the other side of the light that runs to the wiper switch. Sep 7, 2004 · Length of alternator output wire doesn't affect alternator output, it's controlled by battery (or system) voltage, the voltage regulator will increase the field strength in the windings of the alternator until the desired voltage level is reached at the battery (actually measured at the horn relay terminal). With the engine running at half throttle, use a small screwdriver on the test tab inside the D-shaped hole in the rear of the alternator to ground it to the the alternator case (photo below). In fact I know it works because the Alt light came on when I fried it at start up because the connection was not tightened. Mar 7, 2024 · Putts drives a 1965 Galaxie. I've seen some wired with a resistor in line and some without it. Should be a white/red wire on the alternator plug. If it does then you have a bad circuit back to the dash and through the bulb. Oct 22, 2007 · If I can I will try to help a little. We know the light works. 73, GN 200-4r, Craftec Tonneau w/ Electric release, Power Mirrors, Electronic HVAC, ZQ8 rims, Blazer Front brake upgrade, LS1 rear brake upgrade Mar 18, 2016 · And if you don't include a resistor across the lamp terminals, when/if the light bulb burns out the alternator field will not be properly excited and charging performance affected. One post is a sourceing wire one post is a dummy light the Bat post goes to your wire to your amp gauge. 6 and 14. Jun 4, 2024 · low coolant dummy light on dashboard lit 2018 3500 diesel Jump to Latest 305 views 1 reply 2 participants last post by Audiowriter Jun 5, 2024 Nov 20, 2014 · Probably the green /red wire that goes to the instrument cluster. I know the LS2 goats use a sort of phased signal that was able to be dummied by adding a resistor in line. The Lt Grn / Red runs to alternator light. The battery and regulator were replaced and a new problem presented itself. I had them check it and they said the voltage regulator failed, so thinking the voltage regulator was in the back of the alternator I took it off, went to another AutoZone since I bought the last one in stock, had them test it and it FAILED the test (brand new) so I got a new one . If planning on using LEDs for all cluster lights relay will have to be used to power the cluster alternator dummy light. Replaced the alternator with another from another car and still didn't work. Oct 4, 2018 · Alternator Dummy Light Wiring Ls1tech Camaro And Firebird Forum Discussion. 5v which means its getting regulated which is good. 5 GN rear with 3. THis light used to be tripped off the voltage regulator, which was a very simple setup. Light should be on (indicating that it's exciting the alternator to get the charging started) Light magically shuts off? (Indicating that the power is no longer heading to the alternator because apparently this only needs to happen for a short time and only on start to excite the process) Jun 23, 2022 · Common alternator dummy light wiring. This will cause problems. That's why it's commonly connected to the positive terminal on the coil. Jul 10, 2007 · Next you will want to run a ground from the alternator to the case of the voltage regulator. Built-in charge harness for alternator charging. So I'm wondering if I have the option of "remote sensing" at horn relay by simply connecting a wire from #2 alt terminal. Aug 26, 2008 · The first issue was a non-charging one, w/ no alternator dummy light illuminated. These truck use that write the excite the alternator in to charging. I once put my speedometer back wrong and didn't get the alternator light to come on. May 5, 2017 · D+ is normally used on the dash dummy light. 2003 sentra no dummy light coming on except airbag light alternator not charging By chatting and providing Feb 5, 2009 · Wire the other end to the the alternator terminal plug. Sep 9, 2022 · The battery light signal starts at the alternator It comes on when the alternator sees the voltage is low or not adequate The signal then goes to the the PCM PCM then passes it thru data lines to the Gauge control module The gauge control module turns on the battery light So, the battery cable from alternator to battery could have corrosion on it Sep 29, 2018 · hi Guys. Jul 25, 2024 · Wiring the GM Alternator. Oct 16, 2012 · Bingo - alternator charge failure indication. 1 Alternator dummy light. You may connect your "S" terminal to the rear of the alternator at the big battery connection, run it to a remote sensing spot (like a distribution block) for better voltage control, or leave it disconnected and the alternator's voltage regulator will Aug 2, 2021 · So the wiring I have is white wire from pigtail going to the stator plug, the yellow wire from pigtail is going to starter relay b+ (sense wire), green wire from pigtail is going to 12v dummy light feed from original harness which use to go to the dash so the dummy light is gone and it also eliminated the 500ohm resistor which still allows the Jan 23, 2023 · New alternator; tested the old alternator and it was putting off 13-14 at the local Auto Zone. Next run a wire from the Black/white colored wire on the alternator connector to Ground. Discussion in 'Early CJ5 and CJ6 Tech' started by DanStew, Aug 31, 2012. I bought a replacement alternator and the light stayed on. Aug 14, 2013 · The soldered junction is on the other side of the truck in the harness behind the left head light and the four wires that are soldered together are the Alternator charging wire, the voltage regulator (external) sensing wire, the other end of the battery charging wire (Shunt) and the power feed to the firewall connector for the cab. The alternator charge the battery when it's running. So, the answer is. Terminal #1 is connected to one side of an indicator light and the other side of the light is connected to the ACC. morale: Apr 20, 2020 · If your alternator has the PLIS connection, the ignition wire goes directly to the “I” terminal without the need for extra resistance. Dec 2, 2019 · An alternator that’s not putting out enough voltage will usually make itself known when the engine is running. 4-12. When the alternator is charging, it will put +12 on the light bulb, and the light bulb will go out. but when I plug in the purple wire that goes to a relay the motor won’t shut off. In general, the symptoms of an overcharging alternator include a red battery light on the dashboard, a check engine light, blown fuses and bulbs, and damage to the car battery. Not just any bulb will do! (the #194 is 270mA @ 14v). field difference drops to nearly zero and the light goes out; The issue with using an LED instead of a light bulb is that the LED + dropping resistor combined resistance is too high to provide adequate current to excite the field winding compared to a light bulb. Discussion in 'Maintenance/Repair' started by Badlux, Feb 27, 2008. Dec 7, 2023 · When it comes to idiot lights or dummy lights, the most important ones to watch are the check engine light, temperature light, battery light, and oil pressure light. However, the other side isn't connected to negative at boat ground but to the alternator D+ which varies between negative and 12 volts positive. The D+ terminal is negative until the alternator starts to output then it switches to positive and light goes out. Other maintenance lights, like windshield washer fluid and scheduled service alerts, aren’t as pressing and can be addressed at your earliest convenience. I have a charge light in my gauge now and I will be taking the time in the Jul 28, 2024 · If the wiring/bulb is suspect. Voltmeter readings at the battery show that the alternator output is good, charging normally. Jul 26, 2020 · The dummy light works fine when connected to ground and Ign is on, but does not light up when connected to the alternator (1) or (R) post. Oct 26, 2010 · Installed on a 1984 Corvette. Feb 3, 2003 · Generator dummy light Jump to Latest 1K views 1 reply 2 participants last post by AaronT Feb 4, 2003 Nov 24, 2016 · Take any light bulb bigger than 3W, connect one side to battery + terminal, connect other side to the blue wire terminal of alternator connector (use an alligator clip). In fact, the alternator may fail to charge if that light bulb is burned out. The alternator light doesn't come on. May 5, 2011 · Necessity for the Alternator Warning Light It is absolutely essential that the (D+) terminal on the alternator be connected to a functioning "Alt" warning light in the instrument cluster. Is the D+ terminal shorted to ground so when the key is turned the battery light comes on? Then after the alternator is excited the scr is then rectifying? Aug 20, 2010 · Alternator need 12 volt through dummy light to initiate charging sequence, once alternator is energized the ground that was on the D+ leads transition to about 14 volts , same voltage as output on B+ lead on alternator. About three months ago, the battery light came on as I was driving. Nov 7, 2013 · Radio Shack 276-1141, or you can put in a dummy light hooked from ignition to light to exciter wire on alt. Now, remember that when I parked it last night, all voltages were unacceptably low and would not recover. I've been driving the car - starts fine, runs fine, gives no indication of a low battery. Nov 15, 2015 · You have an "SI" style alternator, it has a built in regulator. Car is starting and running fine even in very cold weather. Now according to my wiring diagram, there is a B/Y wire running from the alternator to one side of the light. Start it, verify the light came on, measure about +12V on the battery. The real question is why the hell are you trying to use a KA alternator on an LS1 ??? KA Alt 80A, LS1 Alt 145-155A JEEP LIBERTY BATTERY LIGHT: Q&A on 2008, 2007, 2011, 2005 Jeep stopped charging and battery went dead. Dec 14, 2002 · A1 is the battery dummy light in the cluster. If this light is missing or defective, the alternator will NOT charge the battery! See my hand-drawn wiring diagram above. This 10SI to CS130 jumper connector is also available from Delco (8077) or Painless Wiring (30707). Rebuilt D4TE 390, 4100 electric choke on a Performer, AC, PS, PB, a 1959 MX. Apr 13, 2009 · This is how I upgraded my 65 to a 3G Alternator and still retain full normal use of my dummy lights. Attach the voltage sensing wire (pin 2) to the main power terminal. ~~~ There are two "warning lights" in the instrument cluster on either side of the turn signal indicator. I used a 1995 ford Taurus Alternator reclocked the alternator used a gm vbelt pulley and bought a extra alternator tensioner bracket to extend old bracket. Checked it with a secondary handheld voltmeter and sure enough 16 volts. If it is truly a proper made 3 wire alternator. Mar 2, 2013 · Gauge Light: C3 Empty: C4 Empty: C5 Red-Blu: B10: Seat Belt Reminder Indicator Light: C6 Grn-Red: A5: Parking Brake Indicator Light: C7 Blu-Blk: B7: Cruise Control Indicator Light: C8 Yel-Grn: C18: Water Temp Gauge: C9 Brown: C13: 1st Gear Indicator Light: C10 Green: C15: D3 3rd Gear Indicator Light: C11 Blue: C14: 2nd Gear Indicator Light: C12 Jun 21, 2002 · The issue I am bringing up is that even after replacing most of the engine harness, replacing all the grounds, cleaning and prepping them, replacing the alternator wiring with heavier duty ones I am still getting an alternator dummy light and having similar issues specifically with the headlights and items on the dash not working. Jul 16, 2018 · My wife has a 2005 Toyota Highlander 3. The battery light in the dash is wired in series with the L terminal of the alternator. As you look at the rear of the alternator (facing its rear) there are two terminals, the left hand terminal is "1", the right hand terminal is "2" on an SI. I think. 4v. It is not needed to start or keep the engine running. That means it can't use the housing or base as the ground. This only works with incandescent bulbs. To test the alternator works you could use a test light between battery POSITIVE and the small connector at alternator. Jan 9, 2003 · Jeep-Short Wheelbase. Hope it doesn't confuse things (like I just did with reference to wiring for internally regulated alternator). The sequence of events I guess is what I need to understand. An alternator uses its own power to energize the rotor and create a magnetic field that when rotating induces voltage in the stator. Replace the LED with a small indicator light (conventional filament bulb). Jan 10, 2022 · Try putting the alternator bulb in a working slot and see if it comes on. AWD · Manual; Jun 16, 2008 · I know that I am suppose to use an bulb for the light, but Is it possible to wire a resistor inline with an led to provide the needed resistance, or use Sep 27, 2019 · Turning the key on gives me 12. Works with OEM dash instruments gauge cluster. This wire goes to one side of the lamp. May 5, 2014 · The other one I have installed a dummy light on my dash if I didn’t I had run on. Measure about +14V to verify the alternator is charging the battery. Use your favorite gauge wire, 14-16 should be sufficient. Oct 10, 2023 · +12 V when the ignition is switched on is connected to the Alt light/lamp, that power goes through the lamp finding a ground at the alternator which lights the lamp. It gives you use of the alternator light if you have it, and turns the alternator on when the key is turned. The "GEN" dummy light remains on. I basically would have had to find a battery source voltage and resistor it down to keep the dummy light off but ended up just getting the right alt. I need to know which wires need ignition or battery voltage and I also need to know which wire gets a Resistor and wether or not I need to run one. If the alternator failed to make voltage, this circuit was then LOWER voltage than the ignition circuit passing through the light bulb, so it caused the light to illuminate. Next run a wire from the alternator positive lug to the terminal labeled A. (wire/jumper 3) BTW: Just in case; Simply removing all wires from your alternator except the one on the stud is not proper. Could you have black connector to regulator on upside down View attachment 12044 Apr 23, 2017 · The alternator issue is probably because someone removed the factory dummy light dash, and did not provide the proper resisted or diode blocked 12 volts that the sense wire on the alternator needs. Feb 5, 2005 · No 1 is the wire that runs to the dummy light and has a switch to the ignition. I think I am going to take the alternator off tonight and have it officially tested. Now only the Gen1 light illuminates. Jul 13, 2021 · As for the dummy light on dash, might have to get creative. The kit is not a regulator, but an easy way to convert the car from 1G to 3G. Or, you can see that a short to ground in the indicator wire anywhere between the bulb and the "I" terminal would cause a light-on even if the alternator was charging. You can run a switched 12v directly to the #1 terminal on the alt and it'll do the same thing. Sep 17, 2014 · 4 - Verify the alternator is indeed good. I have now changed the alternator to a brand new one but the problem remains. Or better yet, you should wire the amp light and resistor in parallel. I got a large one, about the size of a dime, from Radio Shack and wired that in and hid it behind May 15, 2014 · You clearly have an internally regulated alternator There isn't an "F" or "R" on a internally regulated alternator, (unless someone has been playing with case parts during the rebuild process). Got it? Tried full fielding it yet? Jun 16, 2017 · So the voltage had the resistance of the bulb to lower it once the power was applied to the rotor. I know I have the dummy light connected to the right terminal (1) on the alt from both the wiring schematic as well as the other terminal (2)or (F) will spark when attached to the (+) post on the alt. After its started, it reads 14. 00 or so for a new Diode Trio for a 27-si alternator, put it in and go find something else to work on. What Type Of Light For A 3 Wire Farmall Cub. Often the current through the alternator warning lamp is necessary for the alternator to start producing power. 85 SS (SOLD), Wicked Ruby Red, Gm Crate 350, Vortec heads,TPI, Serp, TES headers, Choo Choo nose, Acura Leather heated buckets, 2004 Gp Console and Shifter, 8. this will replicate the dash bulb and therefor should light up before the engine is started but should go off as the alternator self excites and starts to work, as above give it a wee rev. You should not even have the old external regulator plugged in. It immediately tells you when your alt stops working and can give you a heads up if you ever kick your serp belt on full throttle attacks. K4 Large Flashing Red Indicator Light Alt Engraved For Alternator Bolts Into A 3/4 Inch Hole Part Number: k4s17-430f-07. Reimagined interior and Luis Rojo art on the hood. The catch is everything works. Badlux Enthusiast. What should I do next? Thanks, Charlie in north Seattle ps; I will also be troble shooting to fix the following as well: Fuel gaugue drops to E when light switch is pulled on, Temp gauge does not work, heater/defroster fan motor doesn't work, nor does the the wiper motor. This is a pretty normal lashup from what I understandalthough with all electronic dashes these days there's probably a different way to do it now. Note, this applies to rigs that don't have an alternator "dummy" light, as the light bulb naturally provides the proper resistance on its own Jul 9, 2020 · Either a battery wire or alternator load terminal wire, to alternator stud. Jul 14, 2008 · here is a 77 alternator wiring diagram. Jan 24, 2014 · Apparent dead alternator, but not true after all. That way if your amp light breaks, your alternator will keep charging. What is the name for it in the AIM or other resources? Where is the Works. Then you must hook it up to excite (Kick start) the alternator. The other side of the lamp is hooked up to +12V battery power. Jul 23, 2016 · I installed the new altenator and the battery light was still on. LED is Light Emitting Diode. Jan 20, 2013 · I want to put an idiot light in my gauge cluster. This could be used to produce a diagnostic code if the alternator had stopped charging. Haha. Scarebird front discs on Cragar 17" S/S. This gives an indication that the alternator's field circuit is intact, and it also provides the current to start the alternator charging. There is one wire (D+) leading off of the top of the alternator that goes up to a few things in the cluster. I know that the light goes on the #1 terminal wire back to the ignition switch. Dummy light has 12 volt+ on one side and the D+(actually negative) on the other, alternator outputs and D+ changes to positive. If the alternator now charges either the internal regulator is bad or there's a wiring problem. Aug 9, 2017 · Its possible that it can still charge with an advisory light illuminated. So to answer your question, there is no need for the light. If you get the diode, make sure you solder it in the right way. Dummy light actually sends the signal to the alternator to charge. I am not running an idiot/dummy light for the alternator. Start the car and rev engine above 1500 rpm while checking charge voltage at battery, anything above 13 V to 14 V is good to go. So, your alternator is not charging properly (test for charge voltage when running). I think been 20 years or more since I did my conversion. It is a direct attachment to the alternator. An LED may not pass enough current to start that process without additional resistors. Nov 14, 2015 · My Web Site--darbys Elky. Basically May 28, 2015 · It's probably the alternator if you didn't get a denso. I know it isnt much help and I dont know which of the last two wires your looking for are colored, but it may be a stepping stone to finding what you need. Jul 8, 2021 · F - this is the Field Duty Cycle. Just make sure to measure the resistance in your factory sense wire (with the battery disconnected and the ignition in the on position) to see if you need this version or the one without the inline resistor. Very seldomly, the battery dummy light will come on just long enough for me to notice. Get a lifetime 3G the first time and it will be the last time you pay for one. Could potentially have a short in the "dummy light" harness there. I've replaced both the alternator and regulator. 1991 Eagle Talon TSi. Alternator Light Stays On. Jul 9, 2021 · Engine run: Diodes at top right ("Trio") provide field coil current, (+) vs. * Strangely enough, i put back the old cable and now i still have the alternator dummy light. It doesn't need an idiot light. As you face the rear of the alternator, 1 is on the left, and 2 is on the right. I used a GM 3-wire alternator for this project. An idiot light needs to be a two wire light. Price: $60. Aug 23, 2013 · A 24V 60A alternator on each of the two engines, dash has VDO oceanline Volt gauges with a warning lamp which is the normal incandescent bulb (5mm dia 18mm overall length) When I start each engine the respective light is on and the annoying warning beeper is blasting, rev counter shows 0 and no V and/or current is flowing to the batteries. (in your case you can run a jumper and the alt can still charge the battery without the dash in) May 2, 2024 · Beside that the alternator needs 12v mega fused connection. The battery light is the exciter circuit for the charging system. Apr 18, 2011 · Wrapping up a new engine and re-wire job on 71 Nova. * After its started, it reads 14. Jun 14, 2013 · It loops from terminal #2 over to the battery connector on the alternator It them goes to the positive on the starter instead of the battery. (wire 1) Alternator terminal 1 to bulb, thru bulb (idiot light) to ignition switch "ON" terminal. The alternator has also been tested. With the key on and engine not running, meaning not charging, the light should light as the alt will supply the ground circuit. Non Stop Process Of Crushing In The Mining Industry Without Jamming Due To Vector Control With Proprietary Algorithms. Jan 31, 2010 · Had an alternator dummy light with the engine running show up the other day on my 94 LX 1. Nov 21, 2018 · Issue is the alternator dummy light goes on with new cable. I used this to upgrade to a CS series alternator, and it worked perfect for that. Nov 4, 2012 · The "alternator light" is wired with switched 12v to the bulb and "grounded" to the alternator field so that it acts as the excitation circuit for the field. Stop, put the belt on, start again, light should be out. Hope this makes sense. Troubleshooting The Ignition Warning Light How A Car Works. Jun 2, 2006 · And still, the darn GEN/Alternator dummy light stays on/glows. Apr 1, 2012 · Just finished doing a ton of engine work which ended up in me pulling the alternator. 40. There should be just one wire (blue) from the (D+) connector on the alternator to the button on the bottom of the normal indicator light in the dash. Found that out the hard way. NEWS PARTS JEEP & 4x4 ATV & UTV Alternator Warning Light. And it could be a 1 wire alternator but I’m putting a dummy light on the dash(or would like to) so I can tell if something is not working right. Joined: Feb 19, 2008 Messages: 274 Likes Received: 0 Nov 21, 2018 · Issue is the alternator dummy light goes on with new cable. But the light IS on. I checked the battery, it was old and wouldn't recharge, so I got a new one. its a 3 wire alternator. Strangely enough, i put back the old cable and now i still have the alternator dummy light. Alternator Wiring How To Wire An Mar 24, 2024 · C3 General - ?Dummy? question - Light? - 1971 Base, No AC, Manual, Small Block Just starting to put the dash in and can?t seem to locate the Alt ?dummy? light to connect the bulb. Alternator and charging system needs to be rechecked. The other wire runs to the Alternator. jdkf pyflyt dxilpc frkz ueity zvdr nzdf xmciob oxjkzb jibmo