I have a 96 Allegro Bus with Cummins motor. I went to start it up after parking it two days ago. I am trying to take it in for service. Rear Airbags flat and transmission issues. So I allowed it to go through glow plug cycle. It starts right up and dies as soon as I let go of the key. It will do this over and over. Surely the problem is electrical. Can anybody give me guidance? There are "Ford" relays behind the dash that click on and off with the key. There also is some starter relays on the frame by the engine/starter. Seems like the starter relay is working fine. More of an key relay issue. Help?