Alternator warning light resistor ford When this happens under the dash to the right of Apr 29, 2010 · the alternator bulb with a LED and also added a 270 ohm resistor in parallel and works perfect– The original message included these comments: just DO NOT replace the alternator warning bulb - it needs to – 97 BMW 540iT 95 XJR6 94 XJS 6. If its electrical circuit has failed, that will effect the alternator charging, as the current through the electrical circuit of the alternator/ignition warning Mar 2, 2009 · The number 1 wire goes to a resistor or dash light and is suppose to glow when not charging. Putting a light bulb in series on that wire can save your day. Nov 7, 2024 · My alternator (ignition) warning light stopped working in my 72 mgb - Alternator stopped working, but car ran as long as battery was charged. WHT (incorrectly shown as ORG) from alternator FIELD to regulator 'F' terminal is Ford circuit 35 3. May 7, 2015 · I don't think there is a resistor in that circuit. I checked for codes on my Code Jul 13, 2014 · Well, I was just speaking with Ford Racing parts tech line, and he said that in order to run an alternator light I have to connect one end of the light to the VBAT wire on the alternator and the other end to a ground. It would have green, black and brown bands, and a 4th band that would be gold or silver. 36000 miles on a 2016 platinum F350 6. Some folks have apparently hooked up with no resistor or light and had the 3G work. Your 3 wires are; Your main output (B/Bat)going to the starter post usually where the power is then directed to the battery with the other end going to the fuse box. I like red lights shining at me to alert me to problems. I don't have any load connected to my "I" wire other that a hot switched wire. Status - The one wire alternator is installed. Yes, with a resister you can have a warning light and sufficient current to kick off the field. 8K views 2 replies 2 participants last post by Putt Dec 28, 2012 Aug 28, 2017 · Alternator troubleshooting for 86-93 5. Rear lamp; Licence plate lamp; L. It is actually a necessary component of the charging system. it has 2 wires from alterntor (no longer needed, you could just go straight to battery), earth, white-red mentioned, a brown supply from a fuse and it is hooked with white wire to battery, so doesnt do anything else as far as i Apr 29, 2022 · Check for a break from ignition switch to warning light. Most hot rodders and muscle car enthusiasts prefer the use of a voltmeter or ammeter to monitor charging. I checked for codes on my Code Apr 19, 2018 · 1987 - 1996 F150 & Larger F-Series Trucks - 1989 F250 2G Alternator Wiring - I took the 460 EFI motor and computer from a 1989 F250 and put them in my 1964 F250 after I hurt the old 292 engine coming back from a camping trip. The bulb is there for the driver. Mar 29, 2011 · The circuit was meant to have an alternator light in it, the resistor is simply to simulate a light bulb if you choose not to use one. I think the only way I can sense charge is to compare battery output (12v nominally, but of course +/- 1. :tup: David Small block with passenger-side upper and lower radiator hoses, and factory alternator brackets. If the warning light burns out, the resistor takes over and supplies the regulator with a turn on signal. 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. Apr 27, 2004 · 15 ohm is correct for this type of ford usa alternator,the current through the bulb only is not enough to energize the field. So when the ignition is switched on the warning li Sep 22, 2020 · The warning lamp should get power to one leg when the key is turned on and the other leg should connect at the alternator D+. Mar 2, 2020 · 1987 - 1996 F150 & Larger F-Series Trucks - '93 F250 5. Apr 7, 2014 · For that matter, the alternator warning light is also part of the field exciter circuit for the alternator, along with a resistor in parallel so the field still gets initial exciter current even if the bulb blows (I say initial because after the alt starts charging, the diode trio provides exciter current from the stator and the alternator self-sustains). If there is little warning light current, there is little field current, and you can get the situation where the alternator doesn't generate even if it spins. Apr 2, 2008 · The alternator generates nearly 15V, it goes to the voltage regulator and gets knocked down to 12V, comes back and goes into the electrical system of the car. requires a hot wire from battery, a ground, and hot wire from key, and a 12 volt supply going through the charge warning lamp. normally this resistor is build in the wiring of the cars. There is an approximately 10-15ohm resistor bridging the alternator bulb connection. Oct 4, 2015 · The alt. You should then have 13. Jan 19, 2018 · No cluster, then no working alternator. (see note 3 below) Note 2: Ignition wire –and resistor wire – these will have to be cut and joined together at the ignition switch terminals 1 & 2. Mustangs Unlimited has different part numbers for "65 6cyl w/ warning lights" and "65 8cyl w/ warning lights", so now I'm trying to figure out the differences. You may have trouble starting the car, hear unexpected noises, or deal with a stalling car engine. 4 volts. They didn't have room (or want the cost) for the tach and ammeter so they added the warning light instead of the ammeter and the light needs the resistor so the alternator will continue to operate if the light burns out. Feb 10, 2020 · Years back I used a resistor wire to excite the 10SI in my car. 5v depending state of charge) to rectifier output (battery voltage plus junction voltage of diode). cranking over the test light should stay on at all times. Apr 19, 2018 · 1987 - 1996 F150 & Larger F-Series Trucks - 1989 F250 2G Alternator Wiring - I took the 460 EFI motor and computer from a 1989 F250 and put them in my 1964 F250 after I hurt the old 292 engine coming back from a camping trip. When the alternator terminal is at 12v the light goes out. Rear lamp; Instrument illumination gauge; Earth (accessory) Interior light switch; Interior light (1) Interior light (2) Interior light (3) Interior light (4) Induction heater button; Induction Mar 10, 2018 · mates was doing same warning light would come on then off done this for a week went to a auto place said needed new alternator 160 for recon got it home few hours later prob came back took it to motor world done a battery test with all lights on and heaters said it was alternator not working 100% and that was a day old lol Feb 25, 2005 · 2005 Roadster Archives - Read Only Jul 21, 2014 · d. I have an warning light that lights up on grounding of cold water, hot water, oil and brakes. It does not light in either case. Mar 2, 2020 · The alternator was charging the battery fully at all times, and never a pause or change, light on or off. Using the Sense wire (white) from the plug (red one dead ended) connected to the original harness. What should it be in parallel with? As someone has said a 47ohm resistor in parallel that is connected in effect across the charge warning light contacts will double the excite current if the light is 3 watt. 0 coupe 99 Ford Croydon , SURREY, United Kingdom –Posted using Jag-lovers JagFORUM [forums. I have an oil pressure gauge and I added a warning light for that too. If you get run-on after adding the resistor, stick the diode shown above Feb 12, 2024 · An LED device is intrinsically a diode, albeit light emitting, so a small LED will probably require a limiting resistor to supply the required amount of voltage and current, which may be relatively lower vs an incandescent bulb, typically as low as 50 milliamps. There is a small gauge wire between the ignition "ON" terminal and the alternator warning light, then from the warning light to the regulator "I" terminal. Ford Escape 2001 - 2012; Ford Focus 2004 - 2011; Ford F-150 2004 - 2014; Lincoln Mark LT 2004 - 2014; Ford Five Hundred 2005 - 2007; Ford Freestyle 2005 - 2007 Jun 17, 2016 · I wired the alternator according to the manufacturer's spec (POS, NEG, EXC to key on power source). Nov 18, 2018 · First off welcome. The warning light supplies an exciter voltage that tells the regulator to Jul 29, 2016 · warning (idiot) light. However, once the alternator energizes almost no current will flow through the lamp. It is there as a backup for the alternator warning light. Apr 15, 2017 · GOOGLE it. All things are possible. Also, if your ALT exciter circuit is a warning light, make sure it’s not burned out and functional. I have a relay connected to my Stator White/Blk wire to trigger my electric choke once the car has started. If there is no factory idiot light available in the dash, I might put the light bulb at the alternator, or I might use a resistor, or a diode, depends on the car. If you have 14 volts one side of the light you obviously don't have an equal amount the other side. The light or resistor affords some degree of Jan 23, 2017 · I have a 1970 mach 1 SCJ Tach car and am having an issue with the alternator light. The light should burn bright with the engine off and key on. If you don't have or want a light, use a resistor. About 2 weeks ago I got a battery warning light that came on. Dec 30, 2016 · If you want to use a led warning light in the dash (like I do because of size/looks/style) you can parallel it with a regular warning light (like a common #194) or a diode, hidden under the dash. If the alternator is fitted with an internal regulator, the wire you want connects directly to a terminal on the back of the unit marked WL or IND. ) The alternator warning light should glow. The alternator warning light should be light when the ignition switch is in the accessory position or in the run position with the engine off. Nov 19, 2022 · NO WARNING LIGHT Note that a 1-wire alternator does NOT permit the use of a charge warning (idiot) light. Jun 13, 2010 · To mimic the resistance of an 1895-type 12V idiot light, like Ford installed on the Galaxie, I wired a 10-ohm, 10 watt resistor in parallel with the LED light. Then Apr 30, 2024 · On the Stangs, it doesn't matter if there is a tach or not- its not in that circuit. However, certain Tuff Stuff alternators like the 7127, 7139 and 7140 series have terminals that may be used for a warning light. The resulting voltage spike can damage the car's electronics including the alternator. I'm thinking it might be length of wires, thinking the alternator position would be the only difference. 7L Diesel. I am guessing we are dealing with a 3 wire si10 or 12 alternator. Dec 2, 2016 · I have a 1969 GT, with an alternator warning light located next to the oil warning light. Apr 27, 2023 · The Problem - I can't get the warning light system figured out so the Alt Warning (old battery charge light) will work properly for an Alternator warning light. The resistor just has to approximate the resistance of the warning light bulb, not be precision. I have the unit functioning just fine, but it isn't right because the LED light i used (has a 600 something OHM resistor built into it) for the charge indicator doesn't shut off. The resistor is just there to be a "fake" light bulb if the bulb goes out. However, certain JEGS alternators have terminals that may be used for a warning light. unplug the regulator, doesnt seem to do anything else anyway. . Again, you can have the LED "light" wired in parallel with the resistor. It carries power to the voltage regulator in case the warning light burns out. If your charge indicator lights up when switch is turned on that circuit should be ok. If not you have an open wire somewhere. I installed an LED light/fixture, and now the car won't start. Does this go in parallel or in series with the led bulb and what resistance should I use, any ideas? Aug 2, 2019 · 1999 - 2016 Super Duty - Battery warning light stays on - Ok here is a weird one. Once pushing power, the alternator voltage causes both wires in the light to become positive, eliminates the ground, and the light goes out. I have wired it up to the schematic that Painless has provided. I asked about a resistor in between and his answer was " I have never did that before but he doesnt think I will need one In the above forum, the OP attached a schematic which has a bridging 5 ohm resistor, a 270 ohm resistor on the anode and a 5 ohm resistor going to the alternator, in this forum it was suggested to use high watt resistors around the 25W mark due to the heat. Will the resistance of a ten foot length of wire be sufficient? Probably, in fact since people have installed this alternator without the resistor at all, clearly they will work - the question is, for how long. Since I hate having to rev up a very cold engine that just started, I always run the "energize" wire to the ignition switch and perfer to install the ""warning light"". The alternator is charging the battery, however the alternator light does not light when key turned to accessory and ON position. I searched through the older posts looking for something like this but came up with nothing. How to fix it? Place a 50 ohm / 5W shunt resistor in parallel with the LED. Not able to find any regularity: it turns on while idling sometimes, or also running down a highway. 2 volts (Charging) going into the battery. Feb 9, 2009 · The field current comes from the warning light connection, so it gets power from either the warning light or from the alternator windings, via the 3 small diodes. Feb 12, 2024 · An LED device is intrinsically a diode, albeit light emitting, so a small LED will probably require a limiting resistor to supply the required amount of voltage and current, which may be relatively lower vs an incandescent bulb, typically as low as 50 milliamps. I have about 3 volts on terminal plugged in to alternator and light is on, with key on and engine off. Mar 17, 2016 · Problem is that kit does not provide a way to drive alternator charge light. Nov 8, 2024 · My alternator (ignition) warning light stopped working in my 72 mgb - Alternator stopped working, but car ran as long as battery was charged. The warning light uses the alternators "F" as a ground and sends battery voltage to activate the field after the engine starts. Could this type resistor wire be used to run through the LED light, to excite the alternator? Pretty sure the wire was single strand. Essentially the voltage from the half wave rectifier will be very close to the battery voltage (which may be at 16v due to the overcharge from the alternator). 4. The current through the warning lamp excites the field when the key is turned on. BLK/WHT from alternator STATOR to regulator 'S' terminal is Ford circuit 4. The schematic shows that one side of the light (black/green) gets power from a splice at the head of the pink resistor wire that goes to the coil and the other side of the light (green/red) goes to the "I" terminal on the regulator. Aug 31, 2021 · Use a test light. Most hot rodders and muscle car enthusiasts prefer the use of a volt meter or ammeter to monitor charging. Nov 7, 2024 · The bulb of the alternator warning light/ignition warning light does not simply serve the function of a 'Warning Light'. To wire a warning light using one of these alternators, simply Aug 15, 2021 · This had me really puzzled since I don't have an alternator warning light. It can also cause dim or overly bright lights, a dead car battery, malfunctioning accessories, or flickering lights. However, I do have another wire connected to my 3G alternator that I forgot about. You have a fault from ign to light. Nov 6, 2014 · 2. A 16 gauge wire is sufficient for this. There is a small gauge wire between the alternator STA terminal and the regulator S terminal. No warning light on dash to say alternator is not charging battery and battery is slowing running out of juice ! I'll get a new alternator and fit it, probably won't have time til this weekend, but feel a lot more optimistic about it after you said it took your 1 hour. Thus I have a voltage gauge and I added a warning light. Not much of a "warning lamp" in that case! Aug 10, 2014 · The dim warning light is usually because there is a bad diode in the alternator. I have been suspicious about the alternator light, can I just add the 643 wire to the rest of them, what do you think? Apr 27, 2006 · The fix is to add a small resistor across (in parallel with) the dash warning light. I was having some alternator issues too, and added a secondary rule: If (battery warning light = true AND rpm > 500) Then throw an big red alert on the screen: Charging System Failure! Apr 13, 2009 · Short story was that it didn't really seem to matter the exact resistance. That’s the reason a 500 ohm resistor can be installed to keep that circuit up. I wired the ignition light (supplied with a switch panel that was purchased for this boat) into the alternator EXC wire in this fashion: Key-on power to the + side of the light, and the - side of the light to the EXC post on the alternator. If your car has an alternator, the warning light wire connection depends on whether the alternator is fitted with an internal or an external voltage regulator. The alternator warning lamp circuit begins at the "common" battery-side lug of the starter solenoid and goes through the ignition switch, then IN SERIES through the warning lamp bulb (which also should have a 560 ohm "bridge resistor across its terminals") to the voltage regulator "I" terminal. I have read If your exciter wire is part of that circuit and the bulb burns out, the circuit fails, and no charge happens. my understanding is that I need about 10 ohms resistance so the warning light only comes on when an undercharge situation at the alternator/regulator occurs. System charges fine at 14. I used an LED and wired a 470 ohm resistor in parallel to match the factory arrangement. Battery charge warning light - Hello My battery charging warning light comes on every now and then. Those alternators can use a higher resistance value. May 14, 2020 · The warning light bulb has less than 15 ohms resistance so as long as the bulb works the electricity will pass through it rather than the resistor. The resistor takes the place of the bulb if it burns out so the alternator still gets excited to start charging. Apr 7, 2014 · For that matter, the alternator warning light is also part of the field exciter circuit for the alternator, along with a resistor in parallel so the field still gets initial exciter current even if the bulb blows (I say initial because after the alt starts charging, the diode trio provides exciter current from the stator and the alternator self Apr 25, 2007 · The resistor is a probably a 1/2 watt part soldered to the instrument panel circuit board. They will generally work with a 180Ω to 250Ω 1 or 2 Watt resistor instead of the 50Ω Ω to 80Ω 5 watt resistor. The resistor wire came out of GM pickup harness, that had the optional voltmeter in the gauge package(no idiot light). Does all of this sound correct, is there a risk of harming the alternator or battery? The original alternator no charge light works by a voltage difference between a separate alternator terminal & 12v at the battery. I have checked the bulb and it is OK. It has worked fine for 5 years now. Aug 2, 2021 · The light should illuminate with the key on engine not running, once started, alternator turning, The "L" terminal should now produce 12 volts and no longer light the idiot light. Will let you know how I get on Feb 24, 2020 · Disconnect resistor wire from alternator and read voltage on the resistor wire connector, It should read battery voltage. Lamp should work as follows: 1) Key off, lamp off off Jul 9, 2021 · 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. Aug 2, 2019 · 1999 - 2016 Super Duty - Battery warning light stays on - Ok here is a weird one. Same as me then. Feb 5, 2024 · The original 10si with out the bleed resistor had to have an energizing wire with either a diode or light bulb in that ciruit to allow the alternator to " turn on",,, as said. Once that happens and the engine is started the alternator should begin charging. Apr 14, 2013 · Fits right onto stock brackets (same dimensions as the old Ford alternators) and retains the stock Ford ALT warning light on the dash, and makes more power at idle than the GM-style does at cruise speed. Oct 10, 2021 · The alternator just needs key-on power on that terminal to function. Mar 5, 2011 · the white wire with red trace at the regulator looks as if it grounds out to turn the warning light on. Do you have an regulator specific for this alternator. The resistor across the bulb terminals is to provide a load, in addition to the bulb, to make a connection in the event that the bulb burns out. I would like to add Hi beam, Alternator and turn signals. H. I have 12 volts from warning lamp with it unplugged from alternator and light is off, key is on. Sep 11, 2022 · The "L" terminal is for the lamp, and the "S" terminal is the "sense" wire to the battery. It's simple and elegant and it works fantastic. May 7, 2015 · 2: The next test is alternator output test, disconnect the battery temporarily, disconnect the connector on the regulator, then reconnect the battery, and start the car, the alternator will put out nothing at this point, so take a piece of wire and on the connector you disconnect from the regulator, jump between the A and F, this applies full Jun 11, 2013 · OK thanks for that. Think the harness was mid-70's. Such a resistor is sometimes fitted so that if the bulb goes there is still start up excitation. Aug 18, 2016 · Ford fiesta 1. Try the 100 Ohm 2 watt resistor (or anything close to that). Unplug the wire from the alternator and it should go off. There is a bypass circuit to keep the alternator functioning in case the light bulb ever burns out. 4 2002 year. Aug 15, 2017 · The 12 volts coming through the bulb excites the alternator to start charging, once the alternator starts charging the green wire is no longer a ground it has 12 volts so the warning light is off. If light fails to glow, go back to Note 1 and recheck ignition bypass. Connect the warning light's positive terminal directly to the alternator's output post. the stator terminal is normally about half of the output voltage and is used by Ford to heat the choke on the Apr 15, 2011 · Here is the theory behind it. This will supply the startup field current before the engine starts. That wire goes to a dash light. I have installed a thick ground cable from the battery to Oct 27, 2011 · Without a warning light, appropriate resistor, or diode in the "excite" circuit, the alternator can charge OUT of the excite terminal, causing the engine to continue to run after the ignition switch is shut off, and/or possibly damaging the diode trio or internal voltage regulator. My battery sensor resistor is about 200 Nov 21, 2008 · When I last had my GT6 running the ignition warning light went out quickly after starting, but since fitting the new speedo, with a built in ignition warning light, the light has not been extinguishing properly despite increased revs. If the resistor did not have as high a rating as the bulb, then it literally becomes that famous "path of least resistance" and though the alternator will work, the light will never light up. For example, when I ran an MSD ignition in my truck, I used a resistor, and it would not shut off when turning off the key, so I added a diode. Dec 26, 2012 · 1965 Mustang alternator warning light wiring Jump to Latest 5. Wire 904 that I mentioned in the top line of post 11 is also a resistor wire and used in the alternator warning light circuit. Aug 16, 2021 · This will preserve the function of your alternator warning lamp with the new alternator. Jun 5, 2007 · I bought one for "65 w/ gauges", which is different than "65 w/ warning lights". Any idea what might be wrong? alternator? warning light resist Jan 8, 2022 · If (amperage across the isolator is > 0A for greater than 0. It should not glow dim with the engine running. No glow, bulb has burned out or there is a break or bad connection in the wiring between the regulator plug and the instrument cluster. Or You could wire up a voltage comparator circuit and the LED that tells you you have less than 13Volts. e. jag-lovers Interior light; Heater motor switch; Direction indicator unit; Dipper-indicator switch; Rear wiring multi-plug; R. Jun 13, 2009 · What's the purpose of the Ignition Light Resistor in my 1987 110 2. Dec 8, 2010 · Jim has ya well covered and I (as usual) agree with his excellent advise, but FWIW I dont really recommend diodes anymore, I say use EITHER at least a 10 (or up to a 100 will work) ohm 5 watt resistor ORRRRRRRR an incandescent (NOT LED too much resistance) dash type small idiot/indicator light. Feb 12, 2023 · You may see the battery warning light on your dash when an alternator fails. You could also use just a resister and and no warning light if you have a voltmeter. The Dash light has 2 terminals one for neg and one for positive. Once I rev the engine up a little bit, the light disappears and the battery seems to be charging OK. The alternator uses the voltage from the warning light circuit as a signal to turn on and start charging. 8L. Jan 8, 2023 · This is an important wire to understand if you are connecting an alternator warning light. battery warning light started lighting up on dash intermittently and when this happens the battery does not charge. Feb 14, 2009 · As shown in the diagrams posted by DAUNTLESS46, about 10-15 ohms. Connecting An Alternator Warning Light To connect an alternator warning light, you will need to locate the ignition switch, the alternator, and the warning light. 5seconds), then it activates the battery warning light. May 11, 2012 · The '96 Camaro I took my engine from had a 470 ohm resistor in parallel with the warning light. GRN/RED from warning light to regulator 'I' (warning light circuit) or from ignition switch to regulator 'S' terminal (ammeter circuit) is Ford circuit 904. I have installed a thick ground cable from the battery to Feb 5, 2024 · The original 10si with out the bleed resistor had to have an energizing wire with either a diode or light bulb in that ciruit to allow the alternator to " turn on",,, as said. Forget about the diode, it's probably a needless complication. 5 N/A Diesel? I'm wondering if this resistor could be reason why the battery warning light doesn't come off by itself when I start the engine. The light should go out when alternator starts charging. Those that don't use a light use the resistor. 100 Ohms will add 120 ma of excitation current initially which should be enough to get the alternator going even at low RPM's. 0 Mustangs: Never, never disconnect an alternator from the battery with the engine running. Ford Escape 2001 - 2012; Ford Focus 2004 - 2011; Ford F-150 2004 - 2014; Lincoln Mark LT 2004 - 2014; Ford Five Hundred 2005 - 2007; Ford Freestyle 2005 - 2007 Feb 24, 2017 · Hello - I built a portable battery charger/jump starter using a Honda GX160 engine and a 1G alternator & regulator from a mid 70's ford pinto. As Action says equal voltages at each side of the light would extinguish the light. I have connected the lead from the separate alternator terminal to the relevant wire on the dash 2 but the light does not go out. Engine off, ignition on, battery fully charged 1. This part of the system is the same, whether you have an alternator light or an ammeter gauge. If you have an ammeter in your instrument cluster, take the GRN/RED (I terminal) and WHITE (F terminal) wires at the regulator plug, remove them from the plug and connect them together using a 100 ohm, 10 watt resistor (see photo below) between the 2 wires. May 14, 2011 · 'a' resistor indicates a single resistor. Started getting worse and other lights stared lighting up, air bag, lost speedo/rev and mileage counter. 5-14. If you use an AMP light, you probably won't even need a resistor -- the light is a resistor. I did not change the resistor, but that might be something to look into. Revised 16-Oct-2016 to add 94-95 alternator wiring diagram Red color text applies to cars with a 3G alternator. Aug 25, 2016 · No cluster, then no working alternator. Oct 5, 2021 · On a tach car the infamous pink resistor wire starts at the plug for the tach, not at the ignition switch as it does on the non-tach car. The bulbs and/or diodes are not needed to excite a 3-wire GM 10/12 SI; they simply prevent engine run-on when the 12 V is cut with the ignition switch Jun 19, 2016 · There is a 500 ohm resistor in parallel with the warning light so that if the bulb burns out, the regulator still gets the exciter voltage. Apr 8, 2013 · Hello, Our 77 MGB is running like a top however the ignition warning light stopped working so I would like to change the light bulb does the warning light unit just pull out to get to the bulb?? Don't want to break anything trying to fix what I believe is a burning out bulb! Thanks in advance for your assistance!! Tom Mar 8, 2015 · Might be teaching grandmother to suck eggs but as I understand it, the logic works like this: One side of the Warning light is 12V+ ignition switched, the other side is connected to the alternator output. Mar 19, 2021 · Obviously the issue began with the Painless harness. If its electrical circuit has failed, that will effect the alternator charging, as the current through the electrical circuit of the alternator/ignition warning Aug 15, 2017 · The 12 volts coming through the bulb excites the alternator to start charging, once the alternator starts charging the green wire is no longer a ground it has 12 volts so the warning light is off. May 29, 2020 · I prefer the idiot light. Disconnect the D connector with the 3 wires (yellow/white, white/black and green/red) from the voltage regulator. Or will light up only dimly and at inconsistent times. This is my question: Is the wire coming off the alternator + or - ? Nov 14, 2011 · As a part of my dashboard redo I installed gauges. The warning light supplies an exciter voltage that tells the regulator to Feb 13, 2024 · At full field the alternator will definitely put out 16+v, depending on the condition of the battery. Mar 10, 2014 · Again, the resistance of the filament IS the resistor for applications that use a light. Mar 22, 2019 · Led Alternator Warning Light - Resistor - posted in Problems, Questions and Technical: I no longer have a filament bulb, so I believe the circuit needs a resistor adding so the Alternator will charge the battery. If the warning light bulb burns out no electricity will pass through it and the charging system won't work so the resistor provides another path for the electricity to flow through to keep the Nov 6, 2023 · Only going through the resistor when the bulb fails. lfpd nlwpjnj incri nhgy vixr krtfew rwmzl gkpea xqgmc aojnhneh