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But a battery power drain can also be the work of a bad alternator diode or even a faulty battery. Depending on the amount of current being drained, a parasitic draw will suck all the juice from your battery in a few hours or minutes. Here, you have four tests to help you find the culprit: The amperage battery drain test. The voltage drop battery drain test. The bad alternator diode test.
A loose belt will also prevent the alternator from charging the battery. Cable testTry this: With the vehicle running, disconnect the negative cable from the battery. If the vehicle keeps running, the battery could be bad. If the vehicle dies, the alternator is probably bad. My battery indicator light came on, but the car would still start and the alternator belt was intact. 2  I tested the alternator with a volt meter and sure enough it was bad. 3  Battery continually going dead. 4  Best thing to do is drive the car to an Auto Parts store and have the alternator load tested.