1 - You need to wire the ammeter into the charging circuit. Reason: A working ammeter will indicate an overvoltage condition by pegging on the "+" side when the engine is running. (Ordinarly once the battery becomes fully charged the ammeter should settle at just to the right of "0".)
2 - Have you measured system voltage with an analog (mechanical needle) voltmeter? Some digital voltmeters - especially cheap ones - can give grossly wrong readings on old tractor electrics.
3 - If the system is truly overchaging and you've got a "one wire" alternator, the alternator has a bad internal regulator. Take it back and exchange it for a different one.
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