Hi John

I am not too sure but I had a problem a few years ago with a hyster which was causing lift lockout and display showing flat battery even though the battery and the settings in the control card were set correct.

I think we managed to change or disable lift lockout through the settings, but that was on the ev100 cards, however this truck I believe uses the Sep Ex GE controllers. However the actual problem was in the traction card.

After reading the following from the SEM controller section relating to lift lockout:

The lift interrupt feature will disable the lift pump controller when the connection at P10 loses the 12 volt signal from the traction controller.

This indicates that it may be that the problem may be related to the traction controller output.