I am trying to install a back up camera system on a 2004 X5. The system works with the key on number 2 position but does not work when the eng in me is running? The Camera mounted on the upper rear panel is c ok none Ted to the how wire of the reverse lights and ground. The monitor is connected Ted via RCA cable from the camera and has a direct 12 v ok it connected to in and a dedicated ground! Any help would be appreciated as this is very fustrating trying to get it working!