x2 on what dicknellen said. The charge line will keep the battery fully charged without pulling the fuse. Your owners manual will tell you (with description) of which fuse to pull.
The pulling of the fuse disables the electronics that run in the background even if the audio system is manually turned off. Found this out by accident one day, I was doing the walk around and heard my sister in laws voice in the car, no one there. When I got back in the MH, DW says the cell phone keeps cutting out, turns out the voice was going through the blue tooth to the car, instead of the phone.
Ken
