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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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