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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 cranks with a loud turnover noise and the car just doesn't start it could be another problem. You also need to remember that the alternator is the equipment that charges your battery. If your alternator is bad the battery will just drain like a flashlight battery until it is dead.The alternator keeps your battery recharged as your car uses it while the engine is running. Bad diodes in the alternator can cause the battery to go dead when the car is off.   The diode bridge (six diodes) is directly connected to the battery, and is used t â¦ o convert three phase delta AC from the alternator's stator to DC for the battery.