"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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