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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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