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Sledge
I have a single wire alt - but i don't think it matters much - your readings are not normal - the bare battery should be about 12.6 volts and when running you should expect between 13 and 15 volts - this would indicate a charge on the battery
It is a pretty simple circuit - it could be the battery, alternater or something intermit that is is taking a very healty slug of current or shorting to ground
If i had to guess, i would guess the alt has a thermal problem and does not charge when hot --- I don't know where it is mounted and how much heat it is picking up - but the easy checks would be get it hot and take it to the local parts place and they can test it --
good luck
jim
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