Can anyone give me a clue as to how to get my reverse camera working?! it was already installed (and working!) when we got the RV but had a huge glass screen moniter hanging over the dash, so i've taken the old one off and installed a lovely new lcd screen from Halfords. problem is, i can't get a signal from the camera! i've got the power hooked up and the screen comes on fine with the ignition, but i cannot get a signal from the camera. the only lead going to the camera is an S-Video lead (picture below) but no power leads, a friend who's good with tv's and dvd's has had a look and is puzzled as he says he's never seen an S-Video lead carry power. the original fittings had black, red and blue wire's going into a plastic box type clip connector, and the S-Video lead, thats it. the black and red are the power but i have no idea what the blue wire does. i know this might be hard to answer but please, any clues?