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Headlights getting bright when stepping on brakes 2003 PT Cruiser

 
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Old 13 Feb 2012, 11:37 am
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Default Headlights getting bright when stepping on brakes 2003 PT Cruiser

Hello folks,
I have a 2003 PT Cruiser, I just had the serpentine belt and alternator replaced, the old one had seized up after the car had been sitting for a few months before I got it. I also put a new battery in it, all within the last two weeks. I am now noticing the headlights get a little brighter whenever I step on the brakes. I've never heard of this before, neither has anyone I've asked. They don't dim when I step on the gas, but they do get brighter when I step on or hold down the brakes. It is definately both of them, and seems to happen on low and high beams. Any ideas what might cause this?

Thank you.
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Old 13 Feb 2012, 02:38 pm
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Default Re: Headlights getting bright when stepping on brakes 2003 PT Cruiser

Weird.

Attach a voltmeter to electrical system.
Let us know voltage readings when this occurs
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Old 14 Feb 2012, 01:36 pm
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Default Re: Headlights getting bright when stepping on brakes 2003 PT Cruiser

Doesn't sound like a major problem, but it could be the voltage regulator. When you press the brake pedal, more power is delivered by the alternator so the voltage regulator increases alternator output to compensate.

To test this theory, place another heavy load on the alternator such as the electric seats, windows and windshield wipers all at the same time and see if the lights brighten.

Just a shot in the dark.
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Old 14 Feb 2012, 02:59 pm
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Default Re: Headlights getting bright when stepping on brakes 2003 PT Cruiser

And - I'd remove filter box, clean battery terminals-
Seems to be an issue with this vehicle as battery is outa sight-
People can't see even severe corrosion
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Old 15 Feb 2012, 08:56 am
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Default Re: Headlights getting bright when stepping on brakes 2003 PT Cruiser

had the same problem with my wifes 05 turned out to be a rubbed wire making contact with the pedal the lights wernt getting brighter they were dimmer and when it made contact it brought them back to full power , i agree with the voltmeter may take a while but thats how i found mine
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