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Low beams not working

Tiny
CHILDERS68
  • MEMBER
  • 1999 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 149 MILES
Low beam head light not working in either mode, regular or DRL. I have checked everything that I know but was running tester on the plugs for the bulbs and both terminals are positive is this normal. Bulbs are new, headlight switch, any help is appreciated. Thanks, Greg
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Monday, October 22nd, 2018 AT 5:27 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

The grounds are connected through the headlight dimmer switch on the column try to cycle the switch many times to try and clean the contacts. Here is a guide to help you check the ground curictur and the headlight wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below). Please let us know what happens.

Cheers, Ken
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Wednesday, October 24th, 2018 AT 12:10 PM

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