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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 it is, the voltage regulator may be out. It may be a stand alone part or an internal part of the alternator. Most shops can check this for you with a simple two wire hook up at the battery. Save yourself some time and trouble and get it checked by a shop.