I do not understand the resistor on the lead from the alternator to the ammeter, could it be a diode? Usually the resistor is the on lead from the ignition switch to the distributor to cut the amperage and extend the life of the points.
You should first confirm that the alternator is positive ground, this is not normal so I would be surprised if it is. If it is actually negative ground the system needs to rewired to negative ground. Is the alternator actually a single wire alternator that does not require being energized from the key switch?
Take a bunch of pictures of the tractor, the wiring, the alternator, ignition switch lugs etc and post them, there are a bunch of smart people on here that are willing to help.
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