1. Switch not closed. (Battery connector, key switch, seat switch, direction switch or parking brake switch): Turn off the switch. If the drive motor still does not run, use a multimeter to detect the voltage and electrical pulses through each switch on the control board. But the foot switch should be on.

2. Insensitive connection. Fuse blown. Check the connection of the battery connector. Check the fuse, drive and logic circuits. If the fuse blows, replace the fuse. Check the all terrain forklift drive motor and forklift control board to find out the possible reasons for the fuse blown. Some may be caused by the following reasons:

A. Operating under excessive transistor load and excessive current limit;

B. Operating under stall conditions;

C. Possible short circuit in the diesel forklift truck drive motor.

3. Low battery voltage. Check the battery terminal voltage. If it is too low, charge the battery. Check all cells in the faulty battery. Check the specific gravity of each cell. The maximum density difference between the battery with the highest specific gravity and the battery with the lowest specific gravity cannot exceed 0.020SG (specific gravity)