4 pin 7 pin needs and uses. . Towing/ Hauling/ Plowing - 4 pin 7 pin needs and uses. - Was looking for some info on this and was surprised there isn't a sticky here, so I have a few questions. I only have a 4 pin on my truck, no tow package. From my understanding 7 pin basically adds breaking and auxiliary power over a 4pin? What kind of things... www.f150forum.com
