I am installing a pioneer avh-x3500bhs in my pickup. I am going to get a reverse camera someday and would like to connect it to the reverse lights. Is there a reverse 12 wire in the cab somewhere? 2003 f250 4x4 ex cab.

 

This is the only thing can find that has any mention of backup lights, but it's a start:

 

Maybe one of these is applicable (they seem to identify a different wire)? Be sure to backprobe the wire to make sure!