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Voltage drop testing is a fast, easy way to check for any problems in any high amperage circuit, like between the battery and the starter, or between the alternator and the battery. A good voltage drop test will quickly tell you if something like a chafed cable, bad connection, corroded battery clamp or bad relay is causing low voltage. And since low voltage is one of the main causes of premature starter failure these days, the voltage drop test is an important diagnostic tool.