Thanks Tom,
I also found a wiring diagram for a 435/445 which gave me enough hope to try again. I printed the two pages and stuck the together, seems rather silly to go make a loop on another page!
I found the 15A fuse terminal not making contact, cleaned that and the cluster came to life again. Then found the starter relay to engage but no output, same thing, one of the terminals was not making contact. The unit was standing outside for a number of years since the engine packed up and the fuse cover was missing. For now I'm getting power on the solenoid wire, not sure if it will sustain a load, but it is a good start.
The brake solenoid sounds to be clicking, horn and lights are working so I'm hoping there aren't any other electrical gremlins waiting for me. I did look at the cab strut hinge pin where the wiring harness passes through but it looked good so still not sure where the short is but I don't have a beacon light or hydraulic quick attach so I can live with it for time being. Looking at the diagram again now and I see the hydraulic coupler switch wire goes to the left hand console, there was a loose wire in there, it might be touching somewhere.
Anybody know how to open and reclose the wiring harness? That stuff is tuff especially on the ends where they doubled up. I need to extend the light wires as they cut them off at the end of the harness. I could just cut it but then it will fray, I'm wondering how the factory got it so neat and tight.