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Hiding from the Ayatollah or making Full Metal Jac
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1,753 Posts
also check with a known good battery.
 
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Hiding from the Ayatollah or making Full Metal Jac
Joined
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1,753 Posts
at higher revs your alternator is up to speed and shoving out 14.7 volts or so, if it's healthy, it's lower revs, i.e. cranking revs, when your alternator can't cover for a failing battery.
 
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