why do my tail and break lights go out when i turn my headlights on ?

1990 GMC SUBURBAN
150,000 MILES
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JOE MARTYNSKI
  • MEMBER
  • 1 POST
my breaklights work only when my headlights are not on.
Sep 25, 2012 at 4:49 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check the ground and circuit board in rear. the ground is left hand rear of frame
Sep 25, 2012 at 5:32 PM
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BLONDIE52966
  • MEMBER
  • 1 POST
C130 Martynski from WI?
Jan 26, 2013 at 9:00 AM
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