AUIII XR8 will not start

[GavL]

Hey guys, over the weekend I've run into a bit of a problem with the ute where it will not start.

When attempting to get the car to start, I put the key into the ignition and turn it to on, the smartshield light stops, but when turning the key to start the car does not crank at all. Battery is good - I fitted up a brand new one from my XR6 to test as well to rule out it being a battery issue.

After this we checked that the starter motor and solenoid are OK by removing it and getting it to work I've had Dad (electronics engineer) start to investigate circuitry with me and has checked the starter relay is OK, +12V to relay and switching 12V is OK but relay does not click due to lack of earth signal from the Body Computer Line. Which we unfortunately ran out of time to check that the Jumper for manual transmission has not come loose etc. Circuit diagram for Start and Charge system is here: http://fordforums.com.au/wsm/wire/aubx/Part%2024-5.html

Does anyone have any clues of anything we should be looking at or experienced the same problem before? Last time I drove it was the weekend beforehand where there were no problems at all, ute had not been touched between last weekend and this weekend with the exception of popping a single ignition lead off the MSD and putting it back on again.