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Gas or electric ?
Where is the F/R switch, on dash or at the knee?
So the f/r directional change is through the controller. So either the controller is bad, or the drive motor has problem. Swap the wires on the f/r switch and see if it changes the direction problem. If it does, motor is ok, and problem is going to be the controller.
I see question is still open, did you find problem?
DId you get cart to run forward?