97 gmc sierra

Asked by Mar 03, 2014 at 04:26 PM about the GMC Sierra 1500

Question type: Maintenance & Repair

Have A 97 GMC Sierra the brake lihgts wont come on!! at first they would not turn off. So
we put new brake switch in. that work then they would not come on. so we changed the
circuit board and put all new bulbs and checked the fuses still does not come on! what
else could it be.....

2 Answers

39,985

Check your tail light grounds. Make sure your main battery ground is good and clean. If they all seem good, I would take one of those 12 volt needle testers and start poking the tail light wires from the rear forward. You will eventually find where you have power. Must be a bad wire or ground.

40

check your brake light relay

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