This is a specific no-start diagnosis on a 2012 John Deere 4105: the fuel shutoff solenoid won't pull in because the fuel pull-in relay thermistor has failed. The owner locates the tiny, hard-to-find thermistor behind relay block 2 (a part the dealer couldn't even identify), shows how it clips into the harness, and proposes a workaround using a momentary switch instead of replacing it. Most useful for 4105 owners facing this exact no-start symptom.
Posted by the Nick the 802 guy channel, an owner working through his own tractor's electrical fault rather than a dealer or professional technician.
