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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.
Remove the negative battery cable while the car is running. If the engine dies, that indicates that the alternator is malfunctioning. This is because much of the car's electrical power comes from the alternator while the car is running. Take the car immediately to an auto parts store. They will be able to give the alternator an electrical test to see if it is bad or if the battery itself is bad and needs to be replaced.