The wiring looms run along the top of the body sections in a tray, there are two, one each side, you can chase them down to the rear light clusters where there will be plugs going down to the bumper light clusters.
On the drivers side floor pan you also have the fuel pipes and rear brake line runs along a piece of steel too with sporadic use of zip ties.
On the drivers side floor pan you also have the fuel pipes and rear brake line runs along a piece of steel too with sporadic use of zip ties.