Question about 2005 GMC Sierra 2500HD 4WD

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I have no brake lights except for hi mount,sometimes they all work,it is a 2005 gmc truck

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Just fixed this tonight! If you let it go, your right rear turn signal will also quit working, and front and mirror signals willbe OK. Have someone watch while you have the Right turn signal on, and lay something heavy like an 8" cocrete block wedged on the pedal. Crawl under the back and looking forward, look at the crossmember that is to the left of the tire. There is a Connector block with 4 plugs. Wiggle the far left blue one. If it works intermittently, that's your problem.

The fix is - clean with CRC or equivelent electrical cleaner, then CAREFULLY take a knife or screwdriver and ever so Slightly move/bend again carefully each of the six pins to the left all the same. I am talking like only a few degrees here, but carefully slide the plug back on and you should have contact. It seems a ground in that plug controls what I just discussed what can be wrong.

Posted on Sep 15, 2010

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Hi and welcome to FixYa,

Your particular vehicle is not that common in my country. However on similar incidents, possibilities are:
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To test for the presence/absence of voltage when the brake pedal is stepped on, a test light is preferred rather than a DVM/VOM.

Good luck and thank you for using FixYa.

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