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The simplest voltage-drop test is to compare the voltage at the back of the alternator to the voltage at the battery posts. The ideal voltage difference should be no more than 0.4 to 0.5 volt. On this Camaro, we measured 14.4 volts at the back of the alternator and a mere 13.5 volts at the battery, which means this Camaro is losing 0.9 volts between the alternator and the battery--about twice the acceptable limit. View Related Article
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