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When you car is turned off your battery doesn't have the alternator pushing that constant stream of voltage to your battery to keep it charged. So your looking at a decrease in voltage by 2 - 3 volts while car is off. No part will fix this just simply start your car before you turn on your head lights.

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βˆ™ 2010-06-08 20:51:10
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Q: Why would your lights dim and your car not start when you turn it off after you just replaced the battery and alternator?
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