Thanks folks for your help. Just to be sure I'm wrapping my head around this correctly and to pass AS Sprinter Electrical 0.101
1. The Main (manual) Disconnect is under the drivers rear jumper seat.
2. It has 3-positions - off, on, in-between.
3. The remote disconnect is by the side door. It only works when the main disconnect is in the in-between position(?). The disconnect switch must be engaged to feed the distribution panel.
Is there a way to have stickies on this forum to highlight the basics for newbies?