You did what I would have done; jumper power to fuse and get it home.
Back trace wire from dead fuse to wherever it goes. I would assume it is a keyed-source as well, but I haven't dealt with the Allison-World controller enough to tell you exactly what it needs. Could be a relay or a loose connection (plug, crimp, loose terminal).
Wire in a test lamp to that dead fuse, then as you're shaking and tapping on things you can watch for the light to flicker on. This will help notify you that you are close to the issue. Don't forget to have the key turned on.
