I am haveing problems getting power to my monitor. If i would step on brakes i could get some power to box, so i am thinking that the 7 pin must be in a different confing than from what the other guy was using. I am using a 8770 Ford and have the diagram for that 7 pin. Would anyone have a wiring diagram for the 7721? The wonderful owners manual is of no help with this. 
Thank you