Question about 2006 Hyundai Sonata

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Head lights will dim

When drinving at night, when you step on the brakes head lights will dim.

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Brake lights draw fairly hefty current; about 50W total (4 amps) so some dimming wouldn't be serious but you might want to remove and clean battery terminals at the battery and the ground (negative) cable that normally is connected to the chassis and/or the engine block.
A low-cost Chinese digital multimeter (< $20 US) would help you locate this kind of problem - and many others around home too. You don't need to be an expert to make use of these and they all come with some kind of Chinglish instructions that sometimes even intelligible. You can buy these at Radio Shack in the US or about any chain auto parts store.
With one of these and a helper to sit inside you can check across the battery terminals directly, then between the clamps, to ground etc. to isolate the source of the voltage drop.    

Posted on Dec 24, 2008

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