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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.
If the alternator is bad, your car or truck will eventually die out again as the battery is not re-charged. Get a good-quality voltmeter or multimeter and test your batteryâs state of charge. The voltmeter should read around 12.6 volts with the engine off and 14-15 volts when the engine is running. If voltage is below 13.5, thereâs a good chance the alternator is not keeping up with your batteryâs charging needs.