How to connect back up/ rear view camera to car radio android Mar 12, 2018Andrea Manconi • 2 years ago. but if you connect the +12v to the reversing lamp wire, you coud use the rear camera only if you use the rear gear. it's better to connect: -gnd to the metal of the car (on some screw) - +12v red wire to the "trigger B". - the "trigger A" to the +12V (for rear camera) that comes from the ISO or CAN BUS cable. Related searches for f250 rear view camera wiring diagram wiring diagram for ford f250ford f250 wiring diagram onlineford f250 wiring harness diagramford f250 wiring schematic2015 f250 wiring diagram2020 f250 wiring diagramsford wiring diagrams free2017 ford f250 wiring diagram