C-12 No Start

I bought a non-running military truck that has a C12. The truck is not starting. So far I have verified fuel pressure at the filter housing. I am getting constant power & ground at pins 52/53 & 65/67 and switched power at pin 70. When I turn the key on the CEL illuminates, but goes off after a few seconds. When cranking I don't see the rpm gauge move, not really sure if I should.

I don't have any CAT diagnostic software or tools. I am going to try and verify crank/cam signal as well as injector pulse on my next crack at it. Any suggestions on what I should try next? If the ecm is damaged, where should I get a replacement or who is recommended in doing repairs?

 

Doesn't have a cruise control button. I figured I should see something on the rpm gauge when cranking, but it doesn't even move. I am going to pin out the crank signal to see if it's sending anything over to the ecm.

If the ecm was completely gone, would the CEL flash? I'll check for fuel at the bleeder. When cranking we cracked the supply line going into the filter housing and fuel was spraying out when cranking. I am also going to put a fuel gauge at that bleeder port. It does have a primer pump.

 

I wish I had a TM for this truck, but they haven't been released. A few months ago these trucks were released to the public, so they are still new to us and we are trying to get manuals. Okay, so the oil pressure and water temp gauges sweep when the key is on. I will try disconnecting a sensor(s) to see if the CEL light comes on.

 

Yes it will run of starter fluid and we tried a gas rag.

The gauge shows about 1100 hours and 7500 miles.

 

24.5v. I haven't load tested them. From what I read, the ecm accepts both 12v or 24v. The ecm also looks original, the painted bolts look untouched.