My 2015 Winne 36Y also had a useless backup/side camera monitor in the radio that was so washed out and glare affected it was impossible to see it. Inside the dash is a switching splitter that has inputs from the rear camera and the two mirror mounted ones (assuming your's has them). It has inputs from the turn signals to switch the camera feed depending on which, if any, turn signal is on. You will need to wire the backup input (originally a feed from the backup lights) to an ignition switched 12 volt feed...the same one to the monitor itself is fine, then the monitor will come on anytime the engine is running. That way you will get a constant view to the rear as you drive down the road. The turn signal inputs will override the backup one. I suspect that was intended by the designers of the splitter to allow the option of constant rear view unless turning. I took the output from that device (that went to the auxiliary video input on the radio) and ran it to a 7" flat monitor I mounted on the dash to the left of the steering wheel. Look on eBay for "7" monitor". Many there new for <$40. You will also want a 7" monitor hood, also from eBay to further reduce glare. It worked excellent with the existing coach cameras and provided a much better display that the crappy screen on the radio. I now feel like a bus driver! I also climbed up and played with the camera tilt to get the maximum view to the back. I kept adjusting the camera until I was just able to see the bumper of the coach.
