the issue i have is with the 7'' screen and the dvd player headunit.
How do i get the screen to play dvd and show the camera? at the moment its telling me it is blocked for my safety. i see everything working, the dvd begins to play then it goes blue.
so the only wire i have left on the screen is the one thats supposed to go to the reverse wire (i think?) its blue. Where do i put this to fool the screen into thinking its safe to show video???
Im thinking either positive or negative. I think positive as it would norm be fixed to the reverse light waiting for it to go on but some internet chatter says negative


any help appreciated as i really cant afford to learn by ''Phizzpop' electronics today.