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The magic relay that fires the solenoid that starts the tractor...
Somewhere in the loop from the battery, through the ignition switch and the safety switches, the solenoid circuit lost the oomph to completely close and fire the starter motor. Symptom, it just clicks, doesn't turn over. Adding a relay on top of the solenoid runs the battery current directly to the solenoid, which can then fully close and start the tractor. Much easier than replacing all the wiring and connections in that loop. Even though this is a Kubota, John Deere part AM107421 worked easily, just drilled out the lug mounting hole to fit on a nearby bolt.