Never had to use the included connector. One was already on the wire bundle, plug into my controller and have a nice day!To connect an in-cabin brake controller, you just need to locate the Passport's brake controller connector under the driver's side dash. With the OEM towing harness kit, it includes a pigtail wire harness for connecting to a brake controller's pigtail wiring harness. Alternative is to buy an aftermarket harness that has the appropriate connectors on both ends to connect between the Passport and specific brake controller. Look for brake controller installation videos on CurtMfg.com or etailer.com.
Another much easier alternative... refer to this thread regarding a Bluetooth brake controller.