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Brake lights

Tiny
JONATHAN WILLIAMS
  • MEMBER
  • 1997 GMC SONOMA
  • 150,000 MILES
I have power going in and coming out of the pedal switch. I have turn signals but no brake lights. I unplugged the harness under the hood and checked power there and none. I checked the ground on the pedal switch and it is good. Is there a relay other than the signal or what else could it be?
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Wednesday, July 13th, 2016 AT 1:50 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Is your third (high mount) brake light working? If so, you likely have a bad turn signal switch.
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Wednesday, July 13th, 2016 AT 2:33 PM
Tiny
JONATHAN WILLIAMS
  • MEMBER
  • 2 POSTS
No brake lights anywhere. By turn signal switch do you mean the multi function?
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Wednesday, July 13th, 2016 AT 2:35 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Yes, I do but that only feeds the two lower lights. Make sure it is not just a bulb in the high mount.
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Wednesday, July 13th, 2016 AT 2:36 PM
Tiny
JONATHAN WILLIAMS
  • MEMBER
  • 2 POSTS
Okay, the truck is gone for a while but as soon as it gets back I will check that. If it is not the multi-function what could possibly be my other options?
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Thursday, July 14th, 2016 AT 4:45 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Then you are going to have to follow a wiring diagram and test the circuit.
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Thursday, July 14th, 2016 AT 9:58 AM

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