I have been down this road for awhile now and back in a day I posted here to find a way to fix my issue with battery drain since my RNS-E doesn't turn itself off. Anyways, after a good amount of time of taking out radio fuse out every time I stopped driving my car for the night I got tired of that rotation. So I came to a conclusion that I should install a button to cut the power off to my RNS-E without taking the radio fuse out. I just have no idea how to go about it or what kinda button would I need and if there is some kinda requirement for the amps ? Anyone has an idea of what I will need to do this right ? I will really appreciate all the help.