Assuming the Alternators typical NEG Ground is being used on a NEG Ground tractor.
1) If it has an Ammeter, the alternators big main output (I use 10 Gauge or larger) wires up to the LOAD (NOT battery/starter SUPPLY) side of the Ammeter, that's the same side that feeds loads such as Ignition and Lights and is the same side where a wire from the BAT terminal on an old Voltage Regulator or Cutout Relay would have wired prior.
2) With no Ammeter it has to get to the hot ungrounded battery terminal to charge it, and that's often where the big battery cables attaches to the INPUT of a starter switch or solenoid, or sure the battery itself.
NOTE if you were to hook it to the NON LOAD ammeter side as posted below the ammeter wouldn't register the alternators charging output HOOK IT TO THE LOAD SIDE... The ammeters other side is the SUPPLY side and its what gets to the battery.
NOTE if the ammeter registers backwards simply swap its leads side to side, easy peasey
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