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by Chris the other white meat on May 11th, 2007

Chris the other white meat

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Why won't my brake lights work on my GMC 5500? The bulbs are ok and the turn signals, hazard lights, and reverse lights work fine. The same goes for the trailer. All but the brake lights work.

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Answers. 4 helpful answers below.

  • by Sarge on May 6th, 2008

    Sarge

    There is definately a fuse for the brakes, it most likely is bad. The fuse is to protect the switch and wiring. Did you try disconnecting the trailer harness and reconnecting the original plug? It might be a broken wire or corroded pin on one of the plugs.

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  • by Skippy on May 6th, 2008

    Skippy

    now i have had 2 of these trucks no... im no mechanic but just a driver.. i would first check the brake light switch... i think it is called thta... it is in behind your brake pedal.. it is only a 20 dollar part so not too expensive.. it looks like a tan covered box... it is a simple desing i only know it is behind there (if your electric brake pump not working with the ignition off that will most likely be the problem) If that does not do it check your fuse box and make sure when the truck is running you hear a clicking comming from it when you push on the brakes... if you dont it may be an electrical problem ( our truck had a hands free and radiio put in aftermaket and the attached the wires to thwe brake wiring and it slowly pulled out the wiring out of the fuse box) dont know really how your truck is rigged up. If i remember correctly the are quite a bit of fuses for the brake lights... 1 one each side for the truck and the trailer. Check to see if you have power in the fuse box under the hood... if you have power there and no power in the cab fuse box there is a problem in the wiring between under the hood and your fuse box.. it took our mechanic 2 days to find it but i have had this problem with both of them that i have driven and they have both only had 90000 kms when it happened.

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  • by Chris the other white meat on May 11th, 2007

    Chris the other white meat

    Honestly I cant find the fuse for the lights. I found two fuse boxes and none are for the lights.

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  • by Gracin the Strange on May 11th, 2007

    Gracin the Strange

    Have you checked the fuse?

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