I cut into the Garmin Rear Camera, BC 20, wire six inches from the camera antenna to set up a splice extension for the antenna with part of the Garmin 50 foot extension (on order). The wire is foil shielded. I found two small wires, a Red and Brown and one larger Black insulated wire. The black wire had a white wire rapped by fine strands of wire. The plug to the video camera has four wire connection.
I plan to drill a 1/4" hole for video camera wire just below the center clearance 12 volt light. I'll mount the camera near this hole then seal it. I'll remove the light as others have described and solder splice in the power to the light wires. I'll have to turn on the parking lights to get power to the camera and wireless antenna. I will drill a small hole at the top of the fiberglass panel and run the antenna wire with a spliced 30 foot section forward on the roof to a homemade aluminum mount to one of the legs to my solar panel. I didn't see any video interference from this location in my testing, but i didn't have the extension.
I'll let you know how this works in a few weeks, dependent on weather.
