Hi Bobble,
Thanks for reply, always appreciated.
Nope, original ignition switch, truck has only done 400 odd hours but is now out of warranty. The customer tells us that the original supplier isn't intetested in maintaining it anymore. Its not all lights illuminating at the same time (understand what you mean about test function) but a number of them are, almost as though theres a short in the loom.
Wiring diagram the best option to go forward if you know anyone who might have one.