Truck won't start

[Kobra62]

Ok, I just got done with a long trip pulling a car trailer with my 2001 f-350 with a 7.3 powerstroke. I got to my destination, shut the truck off, started it, pulled it in a heated shop and shut it off again. I had to fix a problem with my trailer plug. So I go that done and went to start it to pull it out of the shop and all it does is cranks over. The wait to start light won't come on. I have ohm tested every fuse and they're all good. I was told it was the glow plug relay so to test it, I ran a wire from the battey straight to the relay and it connects and the wait to start light comes on. I also have a computer to diagnose the problem but it says "no communication" but it works if i have the jumper wire connected to the relay but that didn't have any info. Please help!

[NoRalPh]

Sounds like the PCM isn't running... No WTS light and the scanners lack of communication means the PCMs not controlling anything.

Recheck the fuses carefully, especially #30 & #19 (#30 is tied to the heater element in the bottom of the fuel filter and it's not uncommon for it to short-out and Kill the PCM fuse it's with. Simply unplugging it and replacing the fuse will solve)