Correction NOHO8K

HI there
Can anyone help me with a wiring diagram or service manual for a cat order picker it says on the Model NOHO8k and serial is 5AF00009.

The problem is the stop light is flashing on when key is turned on and nothing operates, however the 3 line contactors seem to pull in but no steer/lift or drive with the stop lamp flashing.

I have connected the Zapi handset into the B1 controller but no errors are showing on the unit. I could do with a wiring diagram if anyone has one so i can trace back the input wires as when i checked the dead man switch on the floor it does not apear to be working according to the zapi handset, even though the switches themselves are working ok the controller is not getting the feed.

Regards