My Honda CR-V already had a switch mounted under the dash. (Previous owner towed this car and had baseplate and aux tail/brake lights installed). When towing, the key is left in the ACC position and the transmission is left in Neutral. Pulling the fuse (or in my case) flipping the switch, keeps the clock/radio from draining the Honda's battery. I have noticed that when I flip it to the cut-out position the clock's time display stops advancing. When we park at a campground, I put the Honda in Park (so i can lock it up) and flip the switch back on, the clock display updates to the correct time. No radio presets are lost. Whoever wired in that switch, knew what they were doing.
