Thanks guys. I talked with Entegra this morning and was told to push and hold the home button. I told him I had tried that and it didn't work. He then put me on hold and came back in a couple minutes and said the remote would do that for sure. Since there was no remote with the coach I ordered one. It should be here tomorrow, so I'll see how that works.
It is hard for me to imagine that a monitor should be left energized to drain the batteries.
Thanks for your suggestions. If that doesn't work, I am going to install a switch on the dash.