Brake lights stopped working

1990 CHEVROLET 3500
167,000 MILES • 7.4L • V8 • 2WD • AUTOMATIC
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PATRICK WALLACE
  • MEMBER
  • 2 POSTS
My brake lights stopped working. I have replaced the bulbs, circuit boards behind the lights, fuses and the brake light switch. I cannot figure out what to do next.
Jul 6, 2017 at 12:55 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello,

It sounds like it is the turn signal light switch, here is a wiring diagram (below) and a guide to help you get started.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Jul 7, 2017 at 2:35 PM
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PATRICK WALLACE
  • MEMBER
  • 2 POSTS
It isn't the turn lights. When I push the brake light switch as far back as I can it turns off and the stop fuse keeps blowing
Jul 16, 2017 at 12:09 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
I would start at the brake light bulbs, remove them to see if the fuse blows

Please let us know what happens.

Cheers, Ken
Jul 17, 2017 at 9:55 AM
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