2014 XLT 2wd. The unused 4wd plug behind the hi tech coin holder - I see 2.7 vdc on one wire with engine and lights on. Anyone have the pin out ? There's 5 wires- black , 2 white, gray in top row and a single white (or yellow?) with green trace by itself. I would assume 1 is a dimmable source for the 4wd switch . The 2.7 reading didn't change when I changed dash brightness