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More than likely your alternator is faulty. The alternator is supposed to charge the battery and run the car's electrical system when the engine is running. If your headlights dim it means that not enough electricity is being provided.
A simple free test at just about any auto mechanic shop should confirm if the alternator is faulty.
If the alternator is faulty, and it is not just due to a loose belt, you want to replace the alternator as soon as possible. Eventually it will fail to charge the battery, and you car won't start.
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∙ 15y ago
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Why does your lights dim when you hit the brakes?
Weak battery? not holding a sufficient charge Alternator not charging battery sufficiently?
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bad fuse or relay switch
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Your alternator is not working properly
1989 silverado left turn signal set applying brakes causes the left turn signal to dimm and the two right rear tail light bulbs to alternate brightly?
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This happened to me yesterday, I had the alternator checked and it was fine, and the I got a brand new battery and it kept doing it, it ended up being wiring issues so get your wires checked most importantly the ground wire.
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Alternator is going out? battery is going bad?
When was Dim All the Lights created?
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i just had that same problem on my 106 found it to be the relay that was causing the problem!
