2005 Columbia Detroit won’t crank up unless I use ether!!!

My truck freightliner Columbia detroit won’t crank. It was perfectly running but I had an injury amputated two fingers so I haven’t be able to crank the truck everyday. Last week went to crank it up and it doesn’t start at all. Batteries are good, replaced diesel filter has fuel on it, I replaced the crankshaft sensors. The truck will start on just using the ether but once you stop it just turn off. Don’t know what else it can be. Please help if you can. Thanks!!!

 

It was the ecm switched with another truck and as soon as I installed the ecm the truck cranked.
Now I have to find an ecm for the truck.

 

Thank you! Trying to survive the pain is no joke.