Brake Light Not Working

2003 GMC ENVOY

LTAHOE7195

MEMBER
1 POST

Tail lights work on both sides, but the brake light only comes on for the left side and high middle also works, but the right side brake light does not. Would this be considered a brake light switch issue if one of the 2 sides is not working ?

Feb 11, 2010 at 11:31 AM

2CARPRO JACK

✓ASE Certified Mechanic
11,533 POSTS

Hello,

THis sounds like you have a bad connection at the right side light. Here is the brake light wiring diagrams where you can see the two lower lights are connected so if one works the other should as well. Check for power coming to the right socket light/blue wire. Here is a guide to help you.

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

and

https://www.2carpros.com/articles/brake-lights-not-working

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is. Cheers, Ken

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Professional Diagram for 2CarPros Members
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Apr 13, 2021 at 8:12 PM

EJSTADLER

MEMBER
0 POST

Thanks for this post I had a bad light socket they I replaced cost me $34.00 all set! I Love this site.

Apr 13, 2021 at 8:12 PM

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