Hey guys/ gals I need some help. When I brought my 02 dodge the person before me had a b&w ball in the bed along with a 7 way flat connector they mounted in the bed. Upon checking the wiring I only have 6 wires going to the plug instead of 7. can someone tell me what all 7 pins are for (turn, brake, etc.) and where they are located if you look at the plug? Going to get a trailer and just want everything to work before I haul it home.