I am backing JMOR and Gene on this one. Seems like I chimed in on the post that was referenced also.
Have a 1940 M S?N 11XXX that my grandfather bought new and has been in the family ever since. Originally had starter, battery, generator and NO lights or even the 4 position light switch. The cutout had THREE terminals as said. The resistor that is on the 4 position light switch is connected to the third terminal inside the cutout and the field terminal of the generator was connected to this third terminal (F) to give permanent LOW charge.
The way these old tractors were intended to be run was to crank up early in the morning and not shut down until lunch time or maybe even dark. The low charge rate was plenty to keep the battery up under these conditions.
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