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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.
Can a bad alternator cause sparks on the negative battery terminal as well as drain the battery? Over time our car must have lost battery power but the recharging of the battery brought it back up to par. But we are afraid of driving it until the alternator and the electrical system are fully tested out. Can just a bad alternator cause slow draining of battery and CAUSE SPARKS ON THE battery's negative... show more Over time our car must have lost battery power but the recharging of the battery brought it back up to par. But we are afraid of driving it until the alternator and the electrical system are fully tested out.