Brake light problem

CHARLES R MILES SR.

MEMBER
1997 GMC SUBURBAN
5.7L
V8
4WD
AUTOMATIC
191,000 MILES

There are three brake lights, the one on top of the truck works, but the other two on the sides do not. I have no power coming from the wires. How can I have power to the top brake light but not the others?

Monday, October 3rd, 2016 AT 4:07 PM

5 Replies

CARADIODOC

MECHANIC
33,908 POSTS

Without looking at a wiring diagram, I am going to suggest the other two go through the turn signal switch. If they do, the turn signal bulb and brake light bulb are one and the same on the rear. If that is the case and the rear turn signals work, that proves the bulbs and wiring are okay.

If you have access to a good used turn signal switch, try that first. Next, you will need a test light and I will dig up a wiring diagram to figure out where to start.

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Monday, October 3rd, 2016 AT 5:04 PM

CHARLES R MILES SR.

MEMBER
3 POSTS

Okay, thanks I will try another turn signal switch that I have here and I will let you know.

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Monday, October 3rd, 2016 AT 11:18 PM

KEN L

MASTER CERTIFIED MECHANIC
48,289 POSTS

Hello,

Does the hazards work? It can be the hazard switch as well. Here is the wiring diagrams to help troubleshoot the problem.

Please let us know what you find so it will help others.

Best, Ken

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