Why wont my tail lights work

Asked by Sep 13, 2012 at 11:17 PM about the GMC Sierra 1500

Question type: Maintenance & Repair

i have a 1991 gmc sierra 5.7L and my tail lights dont work but my rear signal, reverse and brake lights still work. what would cause this?

4 Answers

37,295

Do you know how to read a wiring diagram and diagnose a wiring issue. If you do then pick up a chiltons and work through the wiring. If you don't then I can't provide you much info outside of that. I don't know off hand how these are wired. I'm thinking there is a possibility it may be a headlight switch. I don't have a diagram to see whether it could be or not.

2 people found this helpful.
835

if its the running/parking lights that arnt working check for power at lights when u have them on, if no power go to the fuse block and find the fuse for running lights or parking lights maybe blown fuse or something

1 people found this helpful.
70

bad ground connection i had that problem

5 people found this helpful.

If your dash lights are out to and the fuse is good look for power at the fuse box if yes your wires under the bed are either cut or apart check tje brn wire for continuity

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