So my seat swap was a success, but not without a hiccup. The drivers seatbelt will unwind about half an inch and lock. That's as far as it will go!  I tried shaking it, beat on the back of the seat, and stuck my pinky finger in trying to find a release. 

Any ideas on what to try next?

Found the drivers side was unplugged from switch/relay under console. Plugged it up but no difference. Even disconnected negative cable on battery and it didn't work. Should I have disconnected both batteries?

Edited January 31, 20178 yr by leon

Seat belt release is a mechanical device as far as I know, there is usually a waight that hangs down and when vehicle moves erratically that weight activates a lever that locks your seatbelt. Maybe smack it a few more times as you wiggle the seat belt.

Disconnected the negative cables for a hour to reset computer and tjatndidnt do it. 

Unplugged the rellay/solenoid/switch/whatever it is under the console for 30 min. The passenger side seat belt locked up and wouldn't unwind either. Plugged back in and drivers side still won't operate but passenger side operates fine again. 

So I guess it's in the belt mechanism itself and has nothing to do with the solenoid under the console. 

Dieselfuture, from what I can gather this year Ram has some electric explosion switch tied in with the air bag and not completely inertia driven. It's a bad design and of course they got away from it. 

Took the belt assembly apart and low and behold now it works!!