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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.
Signs of a Failing Alternator. When it comes to your vehicle, the alternator is a pivotal piece of machinery. The alternator re-cycles the power your car battery uses while driving, restoring the power it has lost while supplying the engine management, climate, entertainment and host of other systems with the juice they need to run properly.