Question about 1994 GMC Sierra

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My rear break lights wont work when my truck is running, but when the truck is off they work fine. The bulbs and break light switch are good still. How do I fix them?

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Check the grounds. there might be a loose ground that is just barely contacting and when the truck is running it vibrates enough to shake it loose.

Posted on Mar 14, 2011

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The AutoZone website may have a wiring diagram in the sites self help repair section.

If you have a voltmeter check for voltage and ground continuity at the bulbs. Check for voltage before and after the brake switch (operate the switch). If you don't have a voltmeter connect something up with a 12V bulb.

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