I have discovered my controller is not the one I assumed it was, so my last post regarding port functions was erroneous. I have updated the list thusly. In addition, the circuitry diagram should come up soon, once I make some edits and clean it up.
1: MCOR (Top left)
2: MCOR (Top right)
3: MCOR (Bottom middle)
4: Unknown
5: Controller power
6: MCOR (Right)
7: Unused (Reversing alarm?)
8: Input from fwd position of SPDT
9: Controller enabled
10: Input from Keyswitch
11: Unknown (Input from mode switch?)
12: Ground from contactor
13: Speed sensor Ground
14: Input from speed sensor
15: Power to speed sensor
16: Input from reverse position of SPDT