Got the drive motor wiring redone, and checked all of the connections on the reversing contactor. Everything seems to match what's laid out in the wiring diagram.
The speed controller is, maybe, responding to throttle signals. A voltmeter reading between the M- lead on the motor controller and the ground terminal shows 0v with no throttle input, and 3.1 v after a certain threshold. According to support at Kelly Controller, this is standard behavior in order to get the motor spinning. Presumably, it will start producing a proper signal when current starts flowing - I'm not sure I can/will source a resistor capable of faking being a motor, so it might just be a hook it up and see what happens situation.
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