Keith - If it charges +20 amps with the "F" terminal grounded, the belt is plenty tight (ie. not slipping).
Now if the battery is fully charged, ammeter bouncing between +3 and +10 is not unusual - it's just the ammeter responding to the rapid cycling of the voltage regulating element (relay) inside the voltage regulator.
Now if the battery is less than fully charged (ie immediately after startup) the ammeter should show steady +15 to +20 amps at full throttle. It should continue charging like this until the battery reaches full charge where it will taper back to your +3 to +10 "bouncing".
However the ammeter bounces +3 to +10 with the battery less than fully charged, the problem a failing voltage regulator.
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