My new electrical gremlin...

I had an '07 780 that experienced a few wacky electrical issues over the 7 years I had it. Now this past 2 weeks I just experienced my first head scratcher with the '14 780 I have now. I was home for a while, and when I left the engine fan was stuck on. That had happened once before in the 150K I have on the truck, but the last time it went off after a couple of miles. This time no such luck. Drove from home in PA to NJ to load. I called the 800# under the visor, they may be great at getting you a wrecker, but the guy I talked to had zilch for technical knowledge. I called my dealership back home. I have the D13, and it has an air line to the fan hub, so it is not the viscous type drive. They said it might be a solenoid, but didn't know where it might be. The air line comes out on the passenger side of the hub, goes back underneath the radiator to the driver's side frame rail, and joins a spaghetti junction of other wires and hoses. I thought I had it traced, except what I thought it was went to the steer axle brake ABS, duh, nope! So I decided to make a trip across the country with the fan on, didn't have time to spend under the load at a dealership.
Then phase 2 of the fun started. Going down the road my seat belt light and then warning beeper came on. I ALWAYS wear my seat belt. Jiggling the latch into the socket would make it go out, until I hit the next sizable bump, then more jiggling push and pull and it would go out. The next morning it would not quit, no matter what I did. 120 miles of dinging later I stopped, unplugged the connector at the floor board/mat, and put a loop of wire in the socket to disable the circuit.
Scheduled to be in the dealership the next Monday, reconnected the seatbelt wiring, it still did not work, until I unlatched and relatched, and it went out. Got to the dealership, and it seemed strangely quiet, heck yes, the fan had disengaged! The dealership couldn't find a problem I wasn't having, and I wasn't going to pay them huge $ per hour to go fishing. But now I am really paranoid.
I have pulled one major hill since, enough to get the system hot enough for the fan to come on, and thankfully it went off too. But I just wonder......