The wire harness comes with the hitch inside the box. You need to run it through the the L/R floor area through a rubber grommet and it plugs in to the left side of the tool tray. The tray has to come out and the harness is taped behind the carpet trim panel. It's a lot of work, but you'll need to remove to 2 storage boxes that have the spring loaded covers, left side storage box, tool tray, and possibly the L/R carpet lower trim to find the vehicle side wire harness.