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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 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
Advertisement
Avatar
BLONDIE52966
  • MEMBER
  • 1 POST
C130 Martynski from WI?
Jan 26, 2013 at 5:00 PM