1999 GMC Suburban Brake lights

1999 GMC SUBURBAN
162,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
GYMZ
  • MEMBER
  • 1 POST
Can you suggest where the problem may be if I can't get the brake lights to work. It is not the fuse or bulbs (all lights are out too including the third brake light) and I replaced the brake switch.
Sep 13, 2009 at 12:15 AM
Advertisement
Avatar
JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Did you use a testlite to check for voltage at the fuse circuit? The fuse that supplies voltage to the brake switch, is hot all the time. Check orange wire at the brake switch for voltage. when the brake switch is activated, the white wire goes hot, carries voltage to brake lites. If all the voltage circuits are good for the brake lites, then check the ground circuits.
Sep 13, 2009 at 1:30 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.