dodge cummins 96

the truck is an auto, and that is correct. i have power at the main feed however no power at the smaller wire. When i turn the key nothing happens. I checked the starter relay and in working order as well. Is there something else im missing here? Now the other factor in this is when this crank issue started i was about ready to pull the trans for a full rebuild. I let the crank issue go for a while in order to get the trans pulled. Now the truck has no trans in it. Is it possible to crank and or run the truck with no trans? - - - Updated - - - i know that sounds like a stupid question but i have nothing else to do on the truck and was trying to diag the crank issue without the trans so i can have the rig up and running once the trans is back from the shop.

Hey guys, im new to the cummins world and so far its been great. I currently own a 96 2500 cummins with a few upgrades however the wiring has been touched by the previous owner and well let just say its a rats nest. Im currently having a no start no crank issue and i also want to go through all of the harnesses and clean everything up. Not sure if anyone can assist with the no crank issue. I am getting power to the start via the largest wire however the trigger wire is not working properly is what im assuming. Starter relay is in working order and i jumped the started to make sure its not the starter. Kinda of stumped. Any help at all would be great!