Mechanics

BRAKE LIGHT DON'T WORK

1994 GMC Yukon

Electrical problem
1994 GMC Yukon V8 Four Wheel Drive Automatic 134000 miles

The tail lights don't light up with the headlights on. They work when I push on the brake pedal and the backup lights work. I replaced all the bulbs and put new cicuit boards in and I also checked all the fuses " there good" Then I looked at the wires and nothing seems to be wrong with them. After checking the fuses and wires, replacing the circuit boards and bulbs they still don't turn on when I turn the headlights on. Can you help me?
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Shnf297
June 18, 2010.



The brake lites aren't supposed to come on with headlites. Are you talking about tail lites?

The brake lites only come on when you activate the brake switch, step on the brake.

Tiny
Internetmechanic
Jun 19, 2010.