The procedure to install an aftermarket trailer brake controller is to do the following: place the terminal on the larger of 2 studs at the front, Locate Connector, locate trailer brake control circuits, pull the trailering wire harness down, match the vehicle harness label circuit functions to the trailer brake controller functions, after completing open the hood and locate the red wire that is taped, break the tape on the red/black and remove the lid from the electrical center.