Question about 1990 GMC Sierra

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No brake, turn, or 4 way lights

1990 gmc sierra 305 4x4

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  • Greg Ward Mar 05, 2009

    all fuses are good. looking for a wiring diagram to trace down possible wiring prob.

  • Greg Ward Mar 05, 2009

    No. Front turn and 4 ways don't work either. The thirrd brake light is out as well.

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  • 206 Answers

Check all the fuses

Posted on Mar 05, 2009

  • afterhoursfi Mar 05, 2009

    Is the problem only on the back of the truck

  • afterhoursfi Mar 07, 2009

    Have you checked the relays?? Also is there a trailer plug wired to the truck, does it have power to the brake circuit could be storted there. Or you have a bad ground check and clean all of them

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