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Quick check for an alternator is output voltage. Should be between 13.75 and 14.25 volts. depending on load. ie a 50 amp alternator should maintain that voltage at full 50amp load. beyond 50 amps the voltage will drop off.
Sounds like your voltmeter is reading a little high with the new battery. Might want to check it's accuracy with a known good multimeter.
Ted
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