I added a backup camera and the screen is blank (black) or shows an error message

When adding a backup camera to any factory Ford screen, it is important to power the camera from an ignition switched source (a power source that is on when the car is on, and off when the car is off). Using the reverse lamp will not work in most cases as Ford's touchscreens require a valid video signal BEFORE the screen is told that the vehicle has switched to reverse. The small delay when the camera is wired to a reverse light will cause either a black screen and/or an error message on the screen.