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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.
Connect the voltmeter between the alternatorâs output (BAT) terminal and Ground. If voltage is 13.6â14.6 volts, the alternator is OK, but power isnât getting to the battery. Go to Step 03. If voltage is under 13.6 volts, go to Step 04. 03. Check the battery cables and alternator charge-wire for bad connections, improper cable and wire size, or corrosion. Repair or replace as needed. Recheck as per Step 02. If voltage is a constant 13.6â14.6, the problem is solved.