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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.
You should connect the voltmeter to the battery as before but not the charging voltage and this should be done after charging the battery or jump starting the car. 13.5 to 14.5 or more volts at idle should be produced by a charging system that operates normally.he alternator may not be putting out enough current to keep the battery charged if the charging voltage is less than 13.5 volts. Make sure the alternator is tested (can be tested at an auto parts store).