Your thread was merged with this one.
Does that camera stay ON when in drive all the while when you are driving or does it go OFF after you start driving? Just wondering because there is a setting that allows the camera to stay ON until you get to a certain speed. Given the age of your Explorer and the likelihood that it is the original camera, I would guess that it is time to replace it. Newer cameras are close to HD picture quality.
You may also want to check out this thread;
Rearview camera view backwards
Peter