There are 2 different wiring schemes here the one on the left switches the batteries in series or parallel, and the wring diagram on the right switches the Motors in series or parallel to provide the high/low function.
The resistor connected to the throttle switch is a Dynamic Braking (DB) load, a missing resistor here, would just mean the when the throttle is released the unit will coast instead of the load resistor introducing a load across the motors (which will be operating as generators when the unit is coasting) to provide braking.
One good possibility here would be that on the physical wiring configuration the resistor was used as a tie point and when the resistor was removed someone did not re-connect the 2 leads that used the resistor as a tie point.
How are you testing the switch with power on or by using continuity tester?
There are many possibilities for wiring errors or open or bad connections here, Also the jumpers on one of the switches could be missing.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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