Question about 1994 GMC Sierra

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I have a 1994 GMC Sierra that has brake and tail light problems. When the head lights are off the tail lights and blinkers function (nearly) normal. When the head lights are on the tail lights and blinkers do not work at all. Could this be a light or blinker switch problem?

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Most likely the rear tail light assys.

Posted on Oct 16, 2010

  • jmgeraets Oct 18, 2010

    The problem was a poor ground connection at the rear to the truck. Thank you for your post.

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Hi, you could have a bad ground, at the rear of the truck, or a bulb, with a crossed filiment, causing the issue. Make sure there is no corrosion at the sockets, and both rear bulbs are visibly in tact. Then make sure the ground is good at both sides. Make sure the circuit boards are good, The actual socket board, as these can corrode internally, and finally, if you have a trailer plug, make sure this is not corroded, or shorting. I feel your issue lies in one of these areas. Good luck...Coop

Posted on Oct 16, 2010

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