If the battery drops below 3 volts of 36 it will stall. There is a fuse in the column that is connected to the traction controller. If it a/c an dual drive motors. touch the drive motor if it is hot then that fuse blew inside the column. Remove the cover and you find it. Also check the lower contactor in the counter weight on the right. 36 or 48 volts should be at the wires connected at the contactor solenoid. The brake switch usually starts steering. press the brake pedal to activate.