I have tried to install a second camera to my factory fitted GPS 2008 Patrol. I made the mistake of cutting the lead at the back of the
vehicle while the camera was on. I now have nothing on the camera circuit but the GPS still operates fine.

Can anyone give me some ideas on trouble shooting. I have the dash out of the car and can access the connections on the back of the unit.
I believe I may have put a short onto the video input as I still have a 12 volt feed to the camera.