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Message: <blockquote data-quote="squeak9798" data-source="post: 490200" data-attributes="member: 555320"><p>Basically an alternator is what supplies the power and charges the battery while the car is running.  When the car is running, if your accessories and stereo pull more power than the alt can put out, it draws the excess current from the battery.  If you run your stereo and accessories with the car off, all of the power comes from the battery.</p></blockquote><p></p>

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