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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.
Solution #2: If the battery wonât hold its charge and your engine stalls out, then itâs time to turn your attention to the alternator. Although your battery may have enough energy to get the engine fired up initially, it will eventually lose power if it is not being recharged by the alternator.