CAN YOU SHOW ME BRAKE LIGHT WIRING HARNESS ...

  • Tiny
  • Anonymous
  • 1999 GMC Sierra
  • 200,000 miles

Can you show me brake light wiring harness diagram for a 1999 GMC k1500 4 wheel drive 5.7

Saturday, March 2nd, 2013 AT 7:55 AM

1 Reply

  • Tiny
  • hmac300
  • Expert
  • 43,704 posts

This is about the best I can do as they are really small. The white wires are power going to t/s switch and overhead cab brake light then it's yellow and green for tailgihts from t/s switch. Also check at rear of frame for ground for all lights they get rusty, dirty and loose contact. Try that first. Also ther eis a circuit board that goes bad in tailights that is available at auto parts

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Saturday, March 2nd, 2013 AT 4:52 PM

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