Hi, JonG and JoeD,

I would like to thank you both for your input on this problem, I would also like to thank my work colleagues
Malcome Maxwell who I liken to brains out of international rescue, and David Zigsworth affectionatly known as Zggy.
First refferring to Joes notes we started with Joes notes and systamatically changed every board on the truck, with no avail to solving the problem, I was beginning to dispare but then rememebered Jon G notes Refferring to a module with slow blow fuses near the joy stick but all I could see there was a module called a voltage filter unit
possible used to smooth the D.C. feeds to theC.P.U.
upon closer inspection I found it housed a slow blown fuse. which was blown, yes we had found something.
Further inspection showed us that the three wires to the module had been put on the wrong terminals, ie, pos wire on neg terminal, neg wire on pos terminal, transposing the wires fitting a new fuse and the problem was solved. The truck now worked correctly.
For the record this truck had been imported from Nth America and had only done 3.9 hrs. on the clock.
Once again many thanks for helping us solve this problem.
Regards Titus