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Brake lights not working with headlights on?

Why does my 89 chevy truck brake lights stop working when I turn on my headlights?

  • Answer:

    My guess is that you either have a failing light switch, or a bad ground somewhere on the vehicle.If it has ever been in a fender bender, check the grounds in that area. FYI the brake lights are independent of the Headlight swithch, but they do interact with back circuits due to shorts and bad grounds. If you are not a tech, you should contact one.

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Other answers

It could be as simple as changing your light bulbs in your tail lights. They can burn out the brake light side and still work using the running light side.

Caveman

wriggle,every wire while someone watches the brake light,all the wires sounds as if you have some corrosion in one of the plug in connectors the only way is to start wriggling wires under the hood,only takes 5 Min's, hope it helps. If you find it cut out the plug and twist wires together,gotta luv old trucks

motox

possible short in headlight switch

Kirt L

Crossed wires

darrenmccbe

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