Low beam headlights not working but the high beams do?

2003 CHEVROLET SILVERADO
250,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
Avatar
KTINKEY9
  • MEMBER
  • 1 POST
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.
Aug 27, 2023 at 2:43 PM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,249 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.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Aug 28, 2023 at 4:00 AM
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.