99 GMC brake light problem

Discussion in 'GM Electrical Tech' started by solo dolo, Jun 22, 2010.

  1. solo dolo

    solo dolo New Member

    my 1999 GMC Sierra 2500. the brake lights have stopped working. The third brake light still does work tho. the only other problem with the lights is that when i turn the hazards on the front left one doesnt work. I dont know if this could be related or not.

    Anyone that can help me figure this out thank you very much

    ---------- Post added at 03:05 PM ---------- Previous post was at 02:42 PM ----------

    i have checked all the fuses, none are blown. all the bulbs are good and i replaced both of the circuit boards for the rear lights. still no brake lights.
  2. KidHauler

    KidHauler Epic Member 5+ Years 500 Posts

    Check the relays for the brake lights. Check the wiring harness at the frame rail to the back lights. Does left turn signal work, but the hazards don't?

    Good luck,
  3. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Also your trailer wiring harness, would be something to take a look at.

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