Forklift,

What is the battery voltage? If it is above 24 volts, take the power cable coming in from the batteries and bolt it to the supply cable coming off the E-stop to the controller. This will take the E-stop out of the circuit and confirm if it is bad. There have been multiple wires around and behind the E-stop that have broken and need repair for similar models. The BDI should show any codes listed in the controller. Check all connectors at the controller for corrosion or failed connections. You can also do the same with the main contactor, connect both cables together, but you must have the drive wheel off the ground to be safe. Good Luck.