My truck, a 2007 Ford F-150, already has a 4-wire connector on it (it's a Reese T-connector). That was all fine and good until I bought my "new" camper. This one is a 6-wire (adds 12v constant power & backup lights) - the camper has surge brakes. I know the truck is somewhat setup for a full 7-wire system because there's a fuse in the fusebox for camper fuses (electric brakes & 12v power). Someone told me that there's a plugin at the rear of the truck for a standard 7-wire system. I just need to buy the plug adapter from a parts store. I found the adapter with no problem, but I can't find the plugin on the truck anywhere.