Headlights not working correctly?

Tiny
JOSUE RODRIGUEZ2
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 193,000 MILES
Hello, my headlights seem to not be working correctly, and I think it might be the switch. I just purchased this car a week ago and need to fix it ASAP. I think the switch might not be making a good connection. A wiring diagram of the front headlight system would be greatly appreciated! Thank you.
Monday, April 28th, 2025 AT 6:23 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,144 POSTS
There are 6 fuses, four relays and the BCM that controls the headlamps, I would check these first, here is a guide to help you test the fuses and I have included the headlight wiring diagrams to show you which fuses and relays to check.

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

Check out the images (below). Let us know how it goes, please get back to us!
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Tuesday, April 29th, 2025 AT 12:01 PM
Tiny
JOSUE RODRIGUEZ2
  • MEMBER
  • 23 POSTS
Thanks. Just so I can get a better visual, is there one on the parking lamps/side markers as well?
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Tuesday, April 29th, 2025 AT 12:52 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Sure, here is the running light wiring diagrams as well. Let me know how it goes.
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Wednesday, April 30th, 2025 AT 10:19 AM

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