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Low beam headlights not working but the high beams do?

Tiny
KTINKEY9
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
My low beams went out, but my high beams still work. My running lights still work so I replaced the switch on the blinker switch and still got nothing. No power at the fuse box and if I take a piece of speaker wire and tap it on the head light wire and the battery they come on.
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Sunday, August 27th, 2023 AT 9:43 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you have a bad ground or a bad low beam control relay, to be sure here is a guide to help 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

Please check ground #g100, also check the fuses. This guide can help

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here is the relay location as well. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Monday, August 28th, 2023 AT 11:00 AM

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