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Old 12-25-2017, 03:30 AM   #4
swedefiend's Avatar
Join Date: Jul 2004

Actually a bad battery can cause a low reading when testing the voltage while running.

So, you can disconnect the ground for the battery after you get the car running and test the alternator output that way. Should be 14.6 or more (on a multimeter - not your gauge in the car).
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