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<blockquote data-quote="94Mazda626" data-source="post: 3588648" data-attributes="member: 582332">Say again?&nbsp; The purpose of the alt is to power the car while it&#039;s running, also as long as you are not asking too much out of the alternator it will charge the battery.&nbsp; A battery charger usually puts out about 14.4 volts and what a coincidence so do most alternators (my car I usually see about 14.7-14.9 volts running).And in response to another post on here, yes the alternator is what the system will run off when the car is running.&nbsp; The battery will add some power if the voltage drops below about 12.5 to maybe 13 volts otherwise it doesn&#039;t even really need to be there.&nbsp; The battery is a storage device so you have power to start your car.&nbsp; if you don&#039;t believe this you can find a stone dead battery that won&#039;t take a charge put it in your car, use another battery to boost it so you can start your car, take the booster cables off and your car will continue to run.&nbsp; At least untilk you turn it off and try to restart it.</blockquote>

[QUOTE="94Mazda626, post: 3588648, member: 582332"] Say again? The purpose of the alt is to power the car while it's running, also as long as you are not asking too much out of the alternator it will charge the battery. A battery charger usually puts out about 14.4 volts and what a coincidence so do most alternators (my car I usually see about 14.7-14.9 volts running). And in response to another post on here, yes the alternator is what the system will run off when the car is running. The battery will add some power if the voltage drops below about 12.5 to maybe 13 volts otherwise it doesn't even really need to be there. The battery is a storage device so you have power to start your car. if you don't believe this you can find a stone dead battery that won't take a charge put it in your car, use another battery to boost it so you can start your car, take the booster cables off and your car will continue to run. At least untilk you turn it off and try to restart it. [/QUOTE]

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