AC, Okay, heres the real deal......
If you turn the tractor off and the battery becomes discharged pretty rapid, the Cutout Relay (regardless if in a 2 wire relay or a full fledged Voltage Regulator) may be stuck closed.
Iffffff thats the case:
1) A working ammeter would swing over to a heavy - discharge.......
2) The battery will discharge in a fairly short time
3) The generator can get hot
More ways to tell if its sticking:::
1) If you remove the belt (just temporarily short term) and then when you turn the tractor off if the relay is stuck THE GENNY WILL SPIN LIKE A MOTOR......
2) If (tractor turned off) when you disconenct the wire to BAT (on a VR or Cutout Relay) a working ammeter would stop showing discharge and/or the genny stops turning...... Be carefult that wire to BAT is hotttt so dont let it short to the tractor
How its supposed to work in a 2 wire cutout relay or a Voltage Regulator is the wire to the BAT terminal (hot voltage) is hot and the relay is normally OPEN, then when you start the tractor and the gennys voltage raises, the relay lacthes closed so the gennys output can become connected to the battery (via the closed relay and an ammeter if so equipped) n charge it butttttttttttt when you shut down the relay opens (unless its sticking closed) to prevent battery discharge and so the gennys isnt seeing voltage n trying to run like a DC motor (which it is)
NOTE: If the relay isnt sticking yet the battery still discharges Probably over a much longer time,,,,,,,,,there may be another short or problem.
Any questions please post back, hope this helps