Why do my tail and break lights go out when I turn my headlights on?

JOE MARTYNSKI

MEMBER
1990 GMC SUBURBAN
150,000 MILES

My breaklights work only when my headlights are not on.

Tuesday, September 25th, 2012 AT 11:49 PM

2 Replies

HMAC300

MECHANIC
48,601 POSTS

Check the ground and circuit board in rear. The ground is left hand rear of frame

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Why do my tail and break lights go out when I turn my headlights on?

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