Hi Tom
Here is a link to information on the Pattern 13 Chevy Wiring Harness, Doesn't make much difference if its a HUP or 3ton as the difference is in the length of the rear harness.
http://www.canadianmilitarypattern.c...nformation.htm
The other real difference is in which instrument panel Commercial Rectangular or the Round Military Instruments.
Here is the image of the harness diagram:
Or for larger Higher Resolution
http://www.canadianmilitarypattern.c...ess%281%29.jpg
Hope this helps
Cheers Phil