My Dodge came with the pigtail to mount a trailer brake controller inside, got that done today. It also came with the 7 way plug in the rear. My 4 pin flat plug on the trailer now has an adapter plugged in to it so I can use the 7 way on the truck. My trailer has the brake power wire run all the way to the jack and it.s just laying around up there. I need to connect the trailer brake wire to my plug. My question is: Do I need to rewire the trailer using a true 7 way plug or is there a way to tie the brake wire into the 4 pin/ 7 pin adapter set up? The only thing I would know to do is tie it to the brake wire on the trailer but I.m not sure that would be the way to go. Help!!!!!!!!!