The Power Harness -  Red Wire 

The RCA Cable - Yellow Wire (Video Cable) 

The Power Harness- The camera should include a male DC power connector to bare power leads. This DC power connector will have a Red 12 volt power lead and black ground lead. *DC red lead will connect to your 12v positive wire to the reverse wire and you may ground the black lead to the chassis.

The RCA Cable- This is the single yellow RCA video cable that is included with the camera, Its sole purpose is to take the video feed from the camera and display it on the monitor

Head unit reverse trigger- The head unit will have a dedicated wire labeled "Reverse" , This wire will connect to your positive lead to the reverse light which enables the radio to switch to camera mode when it received voltage from the reverse light.