koett;
With what information you have I can only take a wild guess. It would be useful information if the S/N group was known and if you have performed the on board diagnostics witb the Micro Command operating system. So you have only one of the two drive motors in normal operation. What is showing in the display? What faults if any are shown? Are power steering and lift operations normal? Depending on your answers will determine if you have open 1 TRN R or L; open motor circuit between TRN and motor; defective driver board; open plug sensor wire; open current sensor circuit; a defective #4 or #5 diode Ror L of course; defective logic card.
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