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Re: 1991 volvo tail lights
Could you take out a bulb and with a testlight/probe check that you do in fact have power to that circuit .Also check that they are the correct bulb for that application I have seen people put indicator bulbs in where therse supposed to be a double filament bulb.Does the base of the bulbs lead contacts line up with the two steel terminals inside the plug?
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Your turn signal lights and brake lights are the same lights . Question : do the front parking lights work ? The front and rear running lights or parking lights are all on the same circuit and fuse . If the front lights work , and the rear lights don't , make sure the bulbs are good first . If OK , I would suspect the problem is either a bad ground in the rear taillight wiring harness or a bad connection in the rear taillight connector Itself .
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.
You say the rear tail turn signals are not working are the fronts working? If the fronts work and the rears don't then you have a wire issue. Check the grounds for the tail lights or check and see if a trailer wire harness was put in by splicing the wires. Also check for brake lights and see if they work should be same bulb. If the fronts do not work either check fuse 18 in the fuse box should be a 10 amp or check brake fuse 2 which is a 20 amp
check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.
ok supaxang, could this solution be as simple as replace the 2 rear bulbs? The brake light and tail light (parking light) are the same bulb, 2 filaments, one for brakes, one for tail lights. If the the tail light filament burns out, the brake light will continue to work ok. It is quite possible that both tail lights burned out, and the brake light filaments are good and still working. Replace w/ bulb #2057. Let me know if this fixes it, if not, I'll keep working on it.