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 - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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