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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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Why would your car not start if you just replaced the battery and alternator?

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Im having the same problem, except for I just replaced my alternator, my battery is 2 years old, I have checked and tightend all connections on the battery, and it ohmed out at 12.5 volts... what the heck, I got jumpstarted after i replaced the alternator, drove home, and I turned my lights on and my car almost died electrically, let it run for about 20, shut it off, and now when I turn my key I get absolutely the dash of death, no lights or noises or anything... crickets chirping My question is: if you have no lights or power when you turn the key, and the battery and alternator are good.... what else can it be??

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