Well we have progress!

Amps now power up. Have steering, movement and lift all working!

However we now have error 61. After using for a few minutes we also get error 8L. What are these in relation to?

Relay K4 is staying latched even after the key is turned off. Its latched as soon as there is power to the truck. K4 seems to power up the VM and with the key in the off position it starts up to error FN. With the key on it seems ok, error 61 is there but error 8L is not.

The nightmare continues

Thanks for the help so far!