Question about 1988 Chevrolet C1500

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Tail lights Why do the rear tail light relay boards burn out. I've replaced them so many times, They will last a while then burn out. What do I do?

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  • yadayada
    yadayada May 11, 2010

    never heard of this issue, are you running trailer wiring through hese relays?

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Make sure that the wires don't have a short in the wires coming back to the rear lights i had to replace one of the wires going to the back of my 88 c1500

Posted on Feb 13, 2009

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Tail lights not working


1) Open circuit on the tail light circuit board (common failure, the metal separates from the backing and must be bridged or replaced).
2) Faulty connection at the tail light in question (the multi-way connector could be dirty or corroded).
3) Kind of rare - the red canister-shaped bulb warning relay has a fault or its connectors are dirty. I have seen this happen where the headlights will not turn on due to this problem. Swapping the bulb-out indicator relay usually corrects this, though be sure to clean the connectors out and try it again before you condemn the unit.
4) Grounds in the rear have either crumbled or are dirty. These grounds are hard to locate under the trunk carpet. They are on either side of the rear of the car. Also - while on the subject of grounds - now would be an excellent time to clean the grounds in the engine bay. These are located behind each parking light on a stub of terminals bolted to the inner fenderwell towards the front of the car. You will see all black wires coming into these on either side. Lastly, check the ground wire for the EFI computer while you are under there. It's a brown wire bolted by a 10mm bolt on the fuel rail. Clean this one off thoroughly while you are there. Good luck!

Feb 02, 2014 | Volvo 740 Cars & Trucks

1 Answer

I have replaced both circuit boards for rear tail lamps. I have verified that all of the fuses are good. Yet, I still have no taillights or dashboard lights. I do have signal lights, brake lights and...


You only need to change the tail light fuse if it is blown. If you haven't checked it already, do that. Those stop/tail bulbs are 2 filament bulbs. One filament is for brake lights, and other filament is for the tail lights. So it is possible to have brake lights and no tails, if the filaments for the tail lights are burned out. But of course, it is unlikely that all the tail lights would be out and all the brake lights still work.

You may need a voltmeter to help solve the problem. It could be a problem in the headlight switch (a problem with the park light function), but is more likely a problem with the Lighting Control Module- or the Body Control Module-whichever your car is equipped with. GM first came out with the LCM, and a year or two later came out with the BCM. Both are mini-computers to control lighting and cabin functions. You would have to use a voltmeter and check things like power in and power out at the BCM of the park lights. You would thus need a wiring diagram to go along with the voltmeter. Those modules are located up under the dash-you can use google to see pictures of them, and maybe find locations.

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1 Answer

I have a Kia Sportage 2001 that the back tail lights and dash broad lights have gone out on. I've replaced the tail lights fuse twice with a 10 amp fuse but they have blown out twice more. What...


COULD HAVE SHORT IN THE INHIBITOR SWITCH OR BACK UP LIGHT SWITCH.CHECK TAIL BULB SOCKETS.LOOK FOR BURN SIGNS AT BULB SOCKET SHORTING OUT.

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The left rear tail lights do not work. the Brake


most have a computer board built into the tail light it could be bad

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1 Answer

Tail lights


These are famous for the circuit boards in the tail lights going bad. If the tail lights are in bad condition, replace the whole tail light, if the lenses are good, then you can buy just the circuit boards. Any (Good) parts store should have them.

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Why would the right rear running light(tail light) constantly burn out. 4 new bulbs in last 4 months, 2002 Jeep Grand Cherokee. No problems with left tail light. Automatic, Air, 4 wheel drive, 200300...


I have a 2002 JGC as well and its the driver side one with mine. I changed the bulb this last time and used bulb lube to cover all the metal. It worked for a mile then went out again but didnt burn out this time. I checked the contacts on the base and noticed there was some rust, scraped off with blade and used more bulb lube on those contacts too, working for now.

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Rear tail lights


Yes, The tail light works on a different part of the bulb than the brake light. That bulb has a burned out tail light filiment. Needs to be replaced.

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1 Answer

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if that doesn't help, you might want to check the bulbs. the damage might have shorted which burned out the bulbs. but you do have one wire that runs to the rear and splits off to the tail lights. the wire should run back to the head light switch via a fuse. the headlights have its own relay. but i hope it is just a fuse.

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9-01 Ford E350 Box Truck No Rear Tail lights


turn off and on head lights liston for click under hood by your battery, that clicks your tail light relay. It has 4 wires in it. with head lights on 3 wires should be hot. if only 2 wires are hot replace relay.

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No tail lights or brake lights


Check the relays associated with the tail lights, I believe that the tail light relay and the turn signal relay are two different entities. Hopefully that helps.

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