The Carter and Gruenwald wiring diagrams only show the wiring for the earlier tractors used with generators.
The parts listing shows a magnetic switch used for engaging the starter on tractors that used alternators. The magnetic switch includes the bypass terminal used for supplying additional voltage for starting. Like Pete posted earlier the resistance used for the coil will be built into the wire that runs between the key switch and the coil.
If you look at the wires attached to the coil I think you will find a connector with two wires coming from the rear of the tractor and just one wire going to the distributor.
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