I've done the hard bit tonight. I've fitted the camera in place of the boot switch. Routed the rca cable to the front of the car near the glove box. Now the wiring up bit.   Firstly, each end of the rca plug has a little red fly lead. Which looks like it would be +12v. Except, the camera end also has a 12v socket and a supplied fly lead that plugs in to this with +12v and -12v red and black wires.   So where do I take the 12v feed from and do I use the 12v socket at the camer