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?

3 Answers

35,255

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.

1 of 1 people found this helpful.
775

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 of 1 people found this helpful.
70

bad ground connection i had that problem

5 of 5 people found this helpful.

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