65 Dart Wagon Conversion to a Sedan Delivery

mpgmike said

Typically, if you supply 12 volts to the one wire and ground to the other, the motor spins in one direction. Reverse polarity on the wires & the motor spins in reverse. The switch controls an "H-Bridge" with 4 MOSFETs (or transistors). The switch will trigger the Gates on one high-side and the opposite low-side MOSFET.

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@mpgmike I tried direct positive and negative leads to the motors and they do work as you described. So I’m thinking it must be in the switch or the wiring harness I bought. other than one terminal, the switch terminals aren’t making contact with the wiring. I’ll contact tomorrow the company I bought the harness/switch from and see what they have to say (even though it’s been awhile)