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more info. do you ever run the stereo without the car on? is there anything in the car that might be staying on when you turn the car off? it is possible that your amps are too large for your alternator to keep up with, but unless they're pretty ridiculous amps, i guess that would be a little unlikely. alternator might be on its way out. get a voltmeter at wal mart and check the voltage of your charging system- with everything you normally have on (including headlights) and the motor at about 3k rpm, should not drop below 13, and if it's SIGNIFICANTLY below that, you might want to invest in an alt upgrade.
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