Let's hear from the guys that got the factory TBC to work with 4 wire plug at the bac
On Ford's website it says that the factory TBC only works if you have 4 and 7 wire plug and a receiver hitch factory installed. In searching thru the various write ups, there's a few guys that say that they only had the 4 wire at the back, but did have the 7 wires by the spare tire under the frame. ( that's what I have, I had 4 wires at the bumper, but when I traced it back I had all 7 wires at the connector by the spare.) Did the factory TBC really work for you. I have a 2010 F150 that's a Canadian XLT, so it doesn't have factory fog lights. I'm wondering if having all 7 wires means the TBC will work.
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A 4x wire is simply for L/R turn, marker lamp and grnd, nothing more. The extra 3x wires on the round 7pin include power to brakes, reverse light and power to the trailer battery.
2012 EB F150 XTR 6.5 Maxtow 7700GVWR, 1700# payload and lots of goodies..... 2012 F150 & 2008 Jayco 23FB
The border between Canada & the USA is a typical human creation. It is physically invisible, geographically illogical, militarily indefensible and emotionally inescapable. Hughe Kingsley