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  1. #1

    Default Weird issue with my headlights while using my horn?

    Ok everyone, I have an unusual one for ya all..

    I have my 2012 Silverado with 5,000 miles on it.

    The other night while driving home, I had to use my horn. When I hit my horn, I realized my headlights cut off (for less than a second, but it was still noticeable).

    When I got home, I started hitting my horn again, and I found that something is randomly cutting off my headlights when I hit my horn. It doesn't always happen; I'd say it happens 1 out of 10 times I hit the horn. Does nothing to my fog lights, it's only screwing up both of my headlights.

    I'd love to take it to the dealer, but I have HID's on my headlights and fog lights and I'm sure they will blame the HID system. (Even though it uses all the stock wiring, and has no other wiring other than connecting into the stock plug). I might try this to throw in the stock bulbs and see if I get the same results..

    Has anyone heard of this before?
    2012 Silverado 1500
    2004 Silverado 1500 (SOLD):
    1977 Silverado C20:

  2. #2


    Sounds like a short somewhere. or maybe a relay in the wrong way.

  3. #3


    It's a poor ground problem, recheck the HID ground wiring, and, or, the grounding for the body panel that the horn/headlights are using.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4
    Jr. Engineer Jamm3r's Avatar
    Join Date
    Dec 2012
    Minneapolis area


    The horn and the headlights share a common ground path. Check for a bad ground. Not sure how things are on the nnbs but on the nbs there's a fairly small ground wire that goes to the inner fender and indirectly to the radiator top support that, if loose or corroded, could explain something like this. You can trace grounds by putting the - of your voltmeter on the ground terminal of your battery and probing around with the + of the voltmeter on the chassis with the headlights on -- if there's more than a quarter of a volt anywhere you have a problem.
    Minneapolis area - 1997 K2500 regular cab long bed + 8.5' Western Unimount plow + modified transmission + 2nd battery + modified camper charge circuit + 1971 Cayo camper -and- 2004 4x4 Suburban 2500 8.1 + Maxbrake controller + 2nd battery + modified trailer charge circuit + Reese receiver, pulls 30' Airstream trailer

  5. #5


    Put the stock bulbs back in and see if it fixes the problem.
    00 Chevy Tahoe LT, 5.3 4x4

  6. #6


    Yup, go back to stock bulbs and test. If the problem persists then leave them in and take it in under warranty. If not, then your HIDs and/or relays for them are the issue.

  7. #7


    Sounds like a grounding issue. But i would try like everyone recommended and put the stockers back in and see what happens. Could be an issue with the kit perhaps?

  8. #8


    Do you have hid with ballasts or just bulbs? Either way i would wire them with a relay to separte the factory circuit in case of a surge or short. That way is also easier to remove when taking it in to the dealer.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.

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