Hello, I have a 2000 GMC Jimmy that came with a rear hitch and tow haul button for towing. I doesn't have a plug connector on it. I need to install a brake controller and plug connector. I bought the 6-pole connector kit but I don't know what to buy other than the controller. If it came with the tow package shouldn't the wiring already be there? Thank you
Brenda
Brenda