Question about Chevrolet 2500

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I have a Chevy 2500 4X4 with brake lights not working. I have all other lights working. I only have one brake light working when I turn on the right turn signal then my left brake light will work. What's wrong here? I keep tracing the wires and don't know what to do from here. I've replaced the brake pedal switch, all bulbs.

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What year?

Sounds like a turn signal switch. Earlier models would use the same bulb for the brake and turn signal. The turn signal switch will interrupt power to the brake light and route the signal to either the left or right bulb depending on with way you where turning. Usually you can wiggle the turn signal switch and get the brake light to work momentarily when this is the problem.

Newer vehicles use a lighting module that looks for inputs from the turn signal switch and brake pedal switch and then decides where to send power. This module is also know to go bad.

Posted on Oct 11, 2010

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