Maybe check the Ford vehicle fuse box... when my entire fuse box went bad, the backup camera did not work when I went to pick it up after servicing. Ford found a yellow video feed wire, but no where to plug it in. I took it back to the RV place that initially tried to work on it, and they fixed it by plugging it into the fuse box in place of another yellow video feed wire that was mistakenly plugged in by Ford. They then had to tape it up because with all the messing around with wires, it would sort of go in and out of blue screen mode. So maybe yours is loose?