I'm trying to hook up a backup camera to my 2003 240C...I need to find a switched fuse to put 12V power to the camera...I don't want to plug into the cigarette lighter and have cables running through car. I tested the fuses in the drivers side fuse panel but couldn't identify a switched fuse....all had constant power...they all seem to control operations that would only be used when car is running...am I missing something? Can anyone help me with this? I have a piggy back fuse adapter that can run 12V to camera if I can find a switched fuse...many thanks, Jim