2000 GMC C3500 headlights

103,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
IAMHUMDINGER
  • MEMBER
  • 2 POSTS
I have high beam lamps, but not low beam. I thought it was the lamps themselves, but unplugged the lamp and turned on the light switch and checked current and found nothing, but I turned on te high beams and stuck the wire with the tester and had current. Are there any other fuses or switches that may be burnt out that I can check without first changing dimmer switch?
Jan 26, 2010 at 5:56 AM
Advertisement
Avatar
JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Hi, I think your on the right track about the dimmer switch, one voltage circuit to dimmer for both high and low beam. The purple wire in the picture, carries voltage from the dimmer to drl, low beam. The tan wire carries voltage from the drl to low beam headlamp.


https://images.2carpros.com/forum/automotive_pictures/170934_drl_relay_1.jpg

Jan 26, 2010 at 6:42 AM
Add a reply
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.

Frequently Asked Problems for This Vehicle