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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Today's Featured Article - Women and Tractors - by Teri Burkholder. The View from the Garage - Never a doubt, everything on our farm is a learning experience. I've been working very hard to get our two rundown Farmall A's sanded, primed , bondo�d, fiberglassed and painted before our big local tractor show called the Tulip Festival. My husband Ben came in the garage one rainy day to see if he could "help". Well if you knew Ben you wouldn't want him anywhere near your spray gun, fiberglass or bondo! So I pulled out the 2 old yucky looking magne
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