Are you sure that this is a 48 V cart does the motor have a speed sensor on the passenger side end, Does the cart have a controller or does it have five solenoids and resistor coils mounted to the solenoids
City carts did the battery install. Ran fine like it should for a few days. One morning got in it , put in reverse and about ate the steering wheel. Now forward or reverse just barely press the pedal...FULL THROTTLE.