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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.
Brushes are the timed failure in alternators. They start at a certain length and they wear at a certain rate so an alternator has a designed lifespan. Add to that the random failures of regulators, bearings, diodes, and belts and you have a high failure rate item on your hands.Some companies have bad designs.. Lack of maintenance. Leaving a battery in a vehicle too long makes the alternator work too hard to recharge the battery. If fools the voltage regulator, which is what usually fails from heat buidup. Get the battery load tested/serviced every October.