I'm trying to install a screen in my dash that has a triggered reverse camera input. I found mention in this forum or another about a light blue wire running along the passenger side of the cab that can be used as the reverse trigger. I found that wire among several other similarly colored wires and ran it to my screen. Unfortunately, that wire also sees voltage when I turn on the blinkers or push the brake. With the blinkers the screen quickly switches over to the reverse input and then switches right back. With the brake it toggles back and forth until i release the pedal. Is there another wire, preferably inside the cab, that I can use that only is activated when the truck is put in reverse?