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  1. #1
    Sr. Apprentice
    Join Date
    Apr 2009
    Location
    Ottawa,Ontario
    Posts
    38

    Default Help with Brake light issue on 97 Chev truck.

    I have a 97 Chev K1500, The original problem I had was I had no brakelights, but I had tail lights and turn signals and fourways, We figured out that the Brake light swith on the brake pedal had shorted out along with the wiring harnes being completly melted (lucky truck didn't catch fire!! LOL), so I changed the switch and the harness, all that being done, I now have brake lights on the left side and third brake light, but not on the right side, on the right side i do have tail light, fourways and right signal, just no brake light!! SO does anyone have an idea of what the problem could be. I'm at a loss, the turn, fourways and brake should be all on the same green wire at the rear, so why don't I have a brake light, when I have everything else???


    Help please!!!

    Thanks


    John
    05 Chev Silverado 3500HD, Crew DRW 6.6 Duramax
    97 chev K1500 ext cab 4x4, 5.7L
    95 Chev K3500 Crew, DRW 6.5L Diesel.

  2. #2
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    493

    Default

    I have the amber turn signals on my truck so the wiring diagram doesn't help BUT I think I remember on an older car that part of the circuit that came into play was the turn signal switch itself. Maybe it has become damaged from the short circuit? Hopefully someone with experience with this will come to your aid. Happy hunting.
    I should ask... you have the combination tail / stop and turn signal in one bulb or is it a seperate turn signal?
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

  3. #3
    Sr. Apprentice
    Join Date
    Apr 2009
    Location
    Ottawa,Ontario
    Posts
    38

    Default

    Not sure, I think the Tail light is a seperate bulb than the turn and brake. Hopefully it isn't the turn signal switch, i've replaced that once already before, their not cheap.

  4. #4
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,378

    Default

    On the older C/Ks such as yours the circuit boards are notorious for shorting out (the panel the actual bulb is in) these are a cheap fix 20 bucks for a new one. Easiest way to tell is to pull the bulbs from the sockets and inspect them for some slight scorching marks.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  5. #5
    Sr. Apprentice
    Join Date
    Apr 2009
    Location
    Ottawa,Ontario
    Posts
    38

    Default

    I was able to get the brakelights to work again, I pulled out the brake relay in the fuse box under the hood and put it back in, and they are working again.

  6. #6
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    493

    Default

    Good to hear! I did not know there was a brake relay.

  7. #7
    Sr. Apprentice
    Join Date
    Apr 2009
    Location
    Ottawa,Ontario
    Posts
    38

    Default

    Well its acting up again..

    The brake lights work fine when the lights are off on the truck, but as soon as I turn on the headlight and touch the brakes, the brake lights lock on and stay on, I changed the brake light relay under the hood with no result, so where do I go now?? At this point I have replaced everything, brake light switch and wiring harness, the turn signal and cruise control switch on the colum and the relay, wtf, whats left now, anyone have any ideas.

  8. #8
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    493

    Default

    Time to get to the basics. Recheck that wiring harness that was changed or damaged by the short, make sure there are no unintentional ground or shorts to other wires. Get a diagram and volt ohm meter and start with the brake relay. Does the headlight and aplication of the brakes cause the relay to activate or is there some other path causing the brake lights to stay on? Oh, and you can't beat this dead horse enough - check your ground connections.

  9. #9

    Default

    Quote Originally Posted by fd8215 View Post
    anyone have any ideas.
    did you see post #4?
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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