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Look at your gauge in the car. If it's above 12, then it's charging the battery. If it's right at 12, then it's not doing anything, if it's below 12 then it's draining the battery.

I agree with Eagle. Every car I've ever owned will charge the battery at an idle. You can let it idle for 20 or 25 minutes, or drive it around for like 10-15 minutes to allow the alternator enough time to put a charge into the battery.
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