Appreciate the answers. My battery switch is faulty, needs replacing. It doesn't shut power off in either position.
I don't leave it plugged in because in the winter I like to leave the tractor's heater plugged in. Both it and the TT are on the same circuit down at the barns and stalls. But the switch on the side of the garage is nearby, so I leave it off until I want to warm up the tractor for snow plowing. Saves a long 75 yard walk through the snow just to plug it in every time I need to. Gettin' old and lazy.