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I'll verify which relay is installed and add a pic to show the wire orientation sometime today. The runaway does not occur until maybe the third or fourth start attempt. It was the same behavior from the first relay. I am going to take a harder look at the diagram too. Thank you!

Unfortunately, I don't think so. This was one of my first thoughts as well. If you reread my first post, I removed any possibility of a mechanical fault with the starter. The runaway was simulated as the 24V feed was disconnected. The solenoid could not actuate this way.. It's a real head...

I've been all over the truck with a DVOM to sort a bunch of issues. A test light was just more handy for verifying relay behavior. There is only 12V showing at the diamond connector. I'm going to try to take a good hard look at the diagrams this evening. I have serious starter circuit gremlins!

I had tried multiple solenoids, relays, and ignition switches before conducting the diagnostic outlined in the first post. The positive connection at the solenoid was disconnected, yet it still simulated the runaway.

I believe this is a very unique set of circumstances that is causing my starter runaway. I'm working with an M1009 and new Wilson gear reduction starter. Doghead relay mod had already been done. The first thing I wanted to rule out was that there is enough clearance for the starter bendix to...