Gene is correct. The field terminal on a cutout relay is used when the tractor is setup with no lights from the factory. The assumption is that the battery will be charged at a rate that assures its recharging with no load placed on it other than starting. It is further assumed that it will be operated at engine speeds well above idle, and for hours at a time much of the time. Usually about 3 to 5 amps at 7 volts or a little more. This was accomplished by using a fixed resistance to ground in the cutout box for the field. If the tractor was equipped with lights, the charge rate was operator adjusted between low charge, high charge, high charge with the lights (Bright beam or Dim beam). This four position switch L-H-D-B had a resistor to ground for low charge, and all other positions was a direct to ground (full fielding the gen). The light switch was not connected (electrically) to the gen switching system other than rotating with it on the same shaft. Lights were power, field was ground.
A three position light switch O-D-B off dim bright was used with a voltage regulator system on later tractors (or as an option or retrofit) to provide battery maintenance without the operator being mindful of the condition of the battery charge state.
If both the resistor in the cutout, and the light switch charge control are connected, the charge rate would be higher than expected. two resistors to ground in parallel provide fewer ohms. If it is a three position light sw. it will not have the correct terminals at all.Best of luck, I hope this explains it.
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