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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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