As I have stated in the lighting forum, I am adding a set of LED auxiliary backup lights, and triggering them off of the OE backup wiring. I haven't made my final descision yet, but chances are if I can't tie in somewhere in the cab, I will tie in at the 7 pin wiring harness out back.

At some point in the future I want to add an upgraded stereo with DVD / NAV / Backup camera system. I know that too will need to trigger off of the reverse lighting circuit. Which leads me to wonder... How would I best tie in both the signal for the lighting (Running through a relay) and the signal for the backup cam to the OE harness? I would rather not string a ton of extra wires back and forth so I am figuring wiring in the cab would be best...

The truck is a 2004 F150 XLT 5.4L 3V 4x4 SuperCab (I know a lot of info, it may help though...)