so i can get mono sound for the dvd player but if i want stereo sound i need the lead?

drex, the link you gave above does not show him to pin 13 or 14 so how is he sending the signal to the screen?

on this link it does, http://www.kb97.co.uk/satnav/reverse.htm. also on the relay pic on the first page pin 13 or 14 is not mentioned.