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

1990 GMC SUBURBAN
150,000 MILES
Avatar
JOE MARTYNSKI
  • MEMBER
  • 1 POST
my breaklights work only when my headlights are not on.
Sep 25, 2012 at 11:49 PM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
check the ground and circuit board in rear. the ground is left hand rear of frame
Sep 26, 2012 at 12:32 AM
Avatar
BLONDIE52966
  • MEMBER
  • 1 POST
C130 Martynski from WI?
Jan 26, 2013 at 5:00 PM
Advertisement