Why do my brake lights not work on my GMC Sierra?
Why do my brake lights not work on my GMC Sierra? I have a 1994 GMC Sierra C1500 2WD with 4.3l w/automatic. It was a fleet vehicle. Plain Jane accept for High Output Heater, Limited Slip Diff and Engine Block Heater. Brake lights were working intermittently. Would come on when pedal as first depressed then go out after pedal traveled down a bit. I put in a new switch and all was well for 3 months. What to do if your brake lights are not working? Ok, changed out turn signal switch and still have no brake lights. Again, i...