I believe you should have a video wire from the camera that goes to the head unit, and the trigger wire I believe connects to one of your reverse lights bulb connection, on one of your rear lights. As far as running it, remove the molding on either the passenger or drivers side front and rear door frame bottoms, and the in between internal body moldings as well, then run the cables necessary, when you get to the back, you most likely have to run the wire up the side and then at the top inside to where the rubber boot that protects/covers the wires that run to the back door is reached, pull the boot loose and snake the wire through the boot (you will also have to remove the rear door inside panel/molding and then snake the wire so it reaches where the plate internal screws/bolts/nuts are located on, then drill the hole small enough to just get the wire out near the license plate area, preferable behind the license plate (so needless to say you have to remove the license plate off the truck to drill the hole! (***warning, if the camera does not have removable rear wires connection, you will have to follow these instructions in reverse!, as the drilled hole in the back plate area will have to be drilled first, then snake your wires through and follow my directions in reverse order!!!) I suggest using waterproof silicone in the back area where you drilled the hole by the license plate area! As that will protect water from coming into the back door of your truck, and I also suggest that if possible, add an inline fuse at the reverse light connection area, so you protect your camera and radio!
