How do you know if an alternator is bad? Where should it read on the amps gauge?
Jun 9, 2008 at 7:04 PM
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BMRFIXIT
AUTOMOTIVE REPAIR CONTRIBUTOR
19,053 POSTS
With a volts meter
connected to the battery terminals read battery volts when engine is running
it should be around 14.5 volts
if under 13 volts alternator may not be charging
if over 14.5 alternator is over charging