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It appears that the Twinput was the culprit. I replaced it with one from a parts truck and the truck shuts down like it should. On another subject, what should the voltages be at each of the terminals on the Twinput and the Duvac while the truck is idling? I'm getting various readings that...

Thanks Chevymike. I'll check that when I get home this weekend.

Ok, I pulled the glow plug control card and it looks in good shape. It still cycles the glow plugs on start up like it should. I started the truck normally, pulled the card and it still continues to run for about a minute before shutting off after I turn the key off. The parking brake warning...

I'll check that out. Thanks.

Would that cause the parking brake light to stay on as well?

I've worked the headlight switch back and forth. Nothing changes. When I shut the switch off, the engine will continue to run for a minute or so then shut down. It is like a relay is sticking, but I can't find one in the schematics that would cause a problem like this

Headlights are not on and ground wire (the one attached at the bus bar ground) is in good shape.

Howdy. I'm fairly new to the site and really appreciate the info here. I'm new to the CUCV world, but not new to the MV world. I just picked up a M1010 ambulance and am having some issues with it. I've got some charging system issues, but that's not what I'm trying to fix right now...