I have also only seen 3 terminal cutouts on any early IHC tractor. The Ford Model A auto used a 6 volt two terminal cutout. The adjustable 3rd brush tapped power from the commutator and supplied the field coils which were INTERNALLY grounded inside the generator case. There was no reason for the third or F terminal on the Model A generator or cutout as the output was fixed depending on the position of the third brush. As John stated however the addition of lighting on the tractors allowed the operator to select high or low charge by varying the field resistance EXTERNALLY of the generator by using the lighting switch or fixed at high output by grounding the wire off the F terminal of the generator under the cutout mounting screw direct to ground. The high output could still be adjusted on the tractor generator by moving the 3rd brush but the external ground allowed two different charge rates. Just my two cents as my 1931 Ford Model A uses the two terminal 6 volt cutout.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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