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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.
RAY: Once the car starts, the battery's job is done. Electricity to fire the spark plugs then comes from the alternator, which is powered by the engine. And in fact, any additional current that the alternator makes is used to recharge the resting battery. TOM: So in the old days, your test WOULD work. You'd disconnect the battery, and if the alternator and voltage regulator were working, the car would keep running. If they weren't working, and the engine needed power from the battery to run the spark plugs, the engine would die.