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I do not know the answer.
I ask, do you have a multi meter tester?
What I would do, is check for continuity, or maybe 12vdc voltage, on the controller, in each direction, at the plug into the motor.
It sounds to me as if it that is where it's at, (the problem with the directional controller), as you describe it working from the one control prompt only, dependent on which way it is plugged in, therefore the motors work okay forward or reverse.
Continuity yes: signal going through.
Continuity no: signal not going through.
I would think continuity test without power present, I am not an electronics tech, I am mechanical tech, so my troubleshooting skills lead me to do this.
To see what continuity looks like on the meter, touch the leads together and see what it reads, looking for ohms reading.
If not continuity, maybe voltage present or not when activated.
You will likely need an assistant.
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Rusty
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