"I plan on changing to a 12volt coil and removing the ballast resistor"
If youre changing to a full true 12 volt coil simply remove the ballast resistor and now the wire from the Ignition switches output (12 volts when ON) goes direct to the coils input which would be + terminal for a negative ground tractor.
The excitation circuit to Alternator is hot 12 volts when the ignition is ON which can be fed EITHER off the coils input or the ignition switches output (same place electrically). I usually place a 10 ohm 5 watt resistor in series in the excitation circuit (from coil or switch to ALTERNATOR) to prevent the tractor from running with ign switch off while some use a diode for that purpose.
The excitation circuit supplies voltage and current to the alternator to get it charging initially.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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