These locos have a very simple electrical circuit.
The wiring of the reversing switch is (going clockwise or counter-clockwise, it makes no difference):
Terminal #1 - connect to the pickups
Terminal #2 - connect to brush #1 (arbitrarily assigned number)
Terminal #3 - connect to the field winding (the other end is connected to ground)
Terminal #4 - connect to brush #2
Throw away ALL of the old wires the insulation is 'kaput'! Replace with new wires.
Ron M
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