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Message: <blockquote data-quote="GearGambler" data-source="post: 506240" data-attributes="member: 11178">once you jump the car, it can run on an almost dead battery - the alternator powers it. also, if you jump a dead battery, then take the cables off right after it starts up, you didnt give the battery time to recharge itself, and you put a very daunting task on the alternator - i've seen stock / tired alts fry as a result. i usually leave jumpers on for 10 mins prior to starting the car, and another 10 mins after the car is running - the car supplying the jump is running the entire time.i agree with what was said above, get a good charge on the battery since its still a good battery (even the parts shops would do this for you) and then get the alt tested, you could have fried it. your problem exists in one of those two areas. let us know what you find out!</blockquote>