Question about 1995 GMC Sierra

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1995 GMC Sierra 4x4 - Having tail light problems

I think I have a short but not sure where, if it is a short causing it. If I turn on any two of the three (lights, blinker, brake) at the same time then both tail lights go out, but not the third brake light it works every time. This is what happens when I use my blinker and brake at the same time - the brake lights go out and the blinker blinks rapidly on the dash and faint on the tail lights until I let off the brake then the blinker will resume normal blinking speed.

Anybody have any suggestions or maybe knows what is causing this problem?

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  • Brian Stowe Mar 13, 2009

    Thanks! I really appreciate you taking the time to help people solve their problems. It helped me.

  • Brian Stowe Mar 19, 2009

    Thanks for both of your tips. I just fixed it during lunch break. It was a loose ground to the frame behind the rear bumper.

    Thanks for your insights. Easy fix.


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Most likely it is a groung issue where your rear wiring harness grounds to the frame. There may also be additional grounds for the wiring harness along the frame before the ground by the rear bumper. One other option is to make sure you have the correct bulbs in. I have seen something pretty similar to that caused by improper bulbs. Make sure your bulbs for the brake light/turn signal have dual filaments as that could be an indication you have the wrong ones; if you have the bulbs I think you do.

Posted on Mar 19, 2009

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Try checking up in the rear wheelwells. What often happens is that mud and stuff weigh the wires down and eventually break the ground loose, and sometimes the hotwire. I have solved several truck light problems easily by fixing those wires. Good Luck

Posted on Mar 12, 2009

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