I crawled under the rig last night to check the wiring and also got the P/N of the Starter. (Delco Remy 8200571 29MT) From what I can tell, this starter is not equipped with over crank protection switch.
The starter of course has the solenoid attached to it and also another relay which I am assuming is the "Stater Relay" twinboat spoke off.
If that is the case it sounds like the best plan of action would be to replace the starter assembly.
According to the cummins wiring, Power comes directly from the battery to the starter. If I can duplicate the problem, I should be able to check for power at the Starter solenoid and relay while the wife turns on the key.
Except for the fact it will be extremely hot under the engine at that point, it [U]should [U]be easy enough.
Plan B would be to take a gamble and just replace the starter... Its not as expensive as I thought it would be. I would think buying OEM Delco Remy would be worth the extra cost than a after market?