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  1. #1

    Default 99 GMC brake light problem

    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. #2


    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,

    1999 Chevy K2500 Suburban 350
    K&N, reworked cai, Thrush cat-backs
    Vinyl, cranks, floor shift, and rear air!

  3. #3
    murdog94's Avatar
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    Feb 2008
    Cloquet, Minnesota, United States
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    Also your trailer wiring harness, would be something to take a look at.


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

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