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First, get a volt meter. Test the voltage of the battery before starting the car, then start it and see if the voltage increased. You should see a jump of about 3-4 volts. Alternatively, if the car has a manual transmission, you could tow the car in gear (very slowly, about ten MPH in first) with the engine off and the battery removed and test to see if the alternator is generating power. Without the battery it should only make about one or two volts, but you will be able to notice it on a voltmeter.
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