Tail Light and Turn signal problem...

[kyle8595]

My passenger rear brake light and turn signal work fine while my parking and driving lights are off but when I switch them on the passenger rear brake and turn signal light do not work ... What could be causing this ? I've replaced the bulbs .

 

[great white]

Easy stuff first; check fuses.

Then check wiring. Pay particular attention to the plug at the rear for the lights (not at the housings but under the bed). This is a common culprit for lots of odd problems. Look for bare wires, although they usually pop fuses.

If it's got a trailer plug wired in pay close attention to that also....

 

[kyle8595]

Easy stuff first; check fuses.

Then check wiring. Pay particular attention to the plug at the rear for the lights (not at the housings but under the bed). This is a common culprit for lots of odd problems. Look for bare wires, although they usually pop fuses.

Thanks man , I'll go check my fuses now.

 

[kyle8595]

It does have a trailer plug but nothing's connected to it and I also have a green wire hanging out from under my dash , not sure where it goes , and an on and off switch

 

[kyle8595]

I replaced all the fuses and still no luck

 

[sewlow]

Tail light circuit board? Notorious POS's.

 

[kyle8595]

Tail light circuit board? Notorious POS's.

Haha is there anyway to test this or just replace it ?

 

[sewlow]

I just replace 'em. Not an electrician. The boards aren't real cheap, but, for me, cheap enough to justify not messin' with the old ones.

 

[kyle8595]

$20 each ? Unless I'm looking at the wrong thing on autozone.com . I'll go buy a passenger one tomorrow and see if it fixes it .

 

[great white]

1991.......straight bulbs, no boards.

*edit*

Hold on a tick, just saw the pic of your truck. It has composite headlights so it should have boards. If you had the 4 individuals it would be straight bulbs.