Car battery died, won't turn over. jump started and ran fine for 10 miles to get home.. Battery too dead to start car once home. Charged battery (it took the charge), then started car, 14.5 volts at battery terminals after start, then declined to 13, 12, 11 volts over 15 minutes. Performed same test 3 hours later, voltage after start never higher then 12.4 volts and declining. Bad Alternator?
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