Question about 1998 Cadillac DeVille

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Tail light is out, brake and turn signal work

My 2002 Deville tail light and front left signal lights are out, brake and turn signal work, bulbs are good, fuses are good, i dont know how to check relays and the cables in the socket do have power, what esle could it be???

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  • Anonymous Mar 30, 2014

    tail and marker lights go on but not headlights think it might be a relay but cant locate it

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Create your own earth wire off the original and screw/bolt to a good earth source.Nothing flash just a test if it works make a more permanant one

Posted on Oct 11, 2008

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1 Answer

How do I fix the tail light in 1999 Cadillac deville when its not the bulbs brake light and turn signal works


That is a three element lamp bulb. Brakes, turn, and tail lights are all in the same bulb. Replace the bulb and all should be OK.

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Why when im driving my 2002 cadillac devile at nite my left tail light is out but when i brake it turns on and if i put signal light it turns on whats the issue


have u replaced the bulb? i believe some tail lights (all?) have 2 fillaments in bulb for tail light (running light) and using both for brake... blinker/ signal is a different bulb usually- that way u have running lights/ break lights at same time ur blinking.

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How do i replace left rear brake light bulb


1) Open trunk
2) Remove small round plastic access panel with a flat tip screw driver by prying open
3) Remove flat tip screw holding tail light assembly
4) Remove tail light assembly by pulling outward, careful not to break plastic guide/nub
5) Disconnect wiring connectors
6) Remove plastic housing access plate on back of tail light assembly by twisting/turning tabs until they click and then lift access plate from tail light assembly
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2007 chevy impala brake light and left turn signal not working


Fast flashing dash signals mean there is a bulb issue-DEFINATELY!

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Running lights work but no blinkers or brake lights. Changed fuses and bulbs no luck


I'm inclined to believe it is the turn signal switch. When you select left or right, the brake light is removed from that side, and the flasher is connected to the bulb instead, making the brake light on that side flash as the indication that you plan to turn. You have lost everything, but the simple answers check out.

If you have lost signals, brake lights and tail lights, then it is more likely that the ground supplied to the bulbs is not working, since the tail lights share noting in common with the brakes lights and turn signals but ground.

If the tail lights work, the fact that the brake lights and rear turn signals share that switch starts to look meaningful — even more so if the front turn signals also don't work. But the front signals and the rear signals use different circuitry in the switch, so it would be something more mechanical in the switch than electrical in that case.

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Sounds like you need to replace the drivers brake/tail light.

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I had this same symptom after I pulled a trailer that had light "issues". I tried wiggling the trailer light connector around until the trailer lights begin working. Next think I know they were not working again and now my left tail light was out. I thought it odd that is wasn't both lights out being on the same fuse, but checked wiring etc with no problems found. Mine turned out to be the "left tail light fuse" in the engine compartment fuse box. All of the parking and tail lights as independently fuse, You can tell which one it is by the guide on the fuse box lid. You will be looking for a 10 amp (red) fuse near the center of the fuse box.

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1 Answer

Left Tail Light not coming on


Sounds like one of two possibilites, the light itself may be a double filiament meaning there is one bulb which does both tail light and brake. One of the filiaments in the bulb could be burned out, try changing the bulb. If not that, then the realy might be damaged which gives power to the tail light. It's a bit of a bigger problem to diagnose.

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