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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.
1 A shorted diode in the alternator can still allow a charging voltage of up to 13.3 volts, and can be detected by the battery going dead within several hours. 2  If this happens, charge the battery out of the car to confirm it is still good. If you measure this voltage within this range the charging system is should be working properly. 2  A shorted diode in the alternator can still allow a charging voltage of up to 13.3 volts, and can be detected by the battery going dead within several hours.