Deceased 02/10/2010 - R.I.P.
Ducati Corse
Posts: 3,170
Join Date: Feb 2002
Location: Darlington, Co. Durham
Mood: NGRRC Minitwins champion 2007
Anywhere between about 13.8 and 14.4v is generally ok. The easiest test is to turn your lights on at idle and rev the motor. they should get brighter.
If you can get your hands on a clamp-on ammeter you will be able to measure whether or not the battery is receiving a charge or discharging when running. Don't try connecting a normal meter inline and then starting the bike - you'll knacker the meter.
if the battery is receiving a charge from the optimate and can start the bike without too much trouble then the chances are that it is ok. it seems like that it's not receiving a charge from the regulator/rectifier when the bike is being ridden.
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