One possible answer is to just get a true one-wire alternator, attach it directly to the "load" side of the ammeter, and be done with it.
If you are determined to make this work, and you have a correct internally regulated Delco 10SI style alternator, you can completely disconnect the excite wire, and manually excite the generator by running a jumper wire to your starter switch, and manually touch it there momentarily after the tractor has started and is running at about 1/2 throttle. If it starts charging, all you need to figure out after that is where to get an LED or a diode.
You do have the BAT wire from the alternator connected to the opposite side of the ammeter from the battery, right? If you connect to the same side, it is bypassing the ammeter and won't show a charge, though it will be charging.
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