robmgf

Thanks a lot guys for your replies, but can I just confirm we are all talking about the same wire , as you'll realise I'm not the most tech person in the world!!!!!
What the kit comes (shame it doesnt have instructions) it comes with the camera, it then has a positive and negative lead that plugs into the camera, I sussed this positive lead attaches to the live feed for the reversing light and the neg lead to earth to tell the camera to send the signal.
You also have a lead with a yellow jack plug each end (video lead), this obviously goes into the camera and also the car radio monitor to send the signal from the camera to radion monior . BUT attached to this lead each end by the jack plug is just a red wire, after doing a bit of research I believe this is called a trigger lead and its function is to change the radio from playing music to display the rear view from the camera automatically without manually changing the function on the radio.
Does make any sence at all ???? and can you help please????

Really appreciate your time for replying Guys. Thanks.