I'm sure we had the same topic last week...
Anyway:
With the bike at about 2000 rpm, the battery should read about 13.5-14.5 volts. Any higher and the reg/rect isn't doing it's job. Any lower and it could be the reg/rec, the battery or the alternator.
With the ignition off, the battery should read about 12.5 volts. Any less than 11.5 and it's due a sesion on an Optimate, or replacement.
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