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check at the alternator...the voltage drop of the wiring can be different...should be 14 volts running...I usually do the load test at autozone, their machine will indicate if faulty or not, they can usually do on vehicle too...however, even my current alternator (after 3 showing low volts at idle) I settled on one that keeps 12 while running...not the best but it works and keeps my battery light off...im sure it contributed to my last battery failing after 10 years...
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