Also on the left headlight harness are the wires for the left headlight (yellow #13, white #14 and the brown ground #20). These feed into the headlight bucket and are weatherproofed via a supplied rubber grommet. Use the silicone spray to ease these wires through the rubber grommet. The ground wire is attached to the body inside the trunk with a Philips screwdriver, while the other wires' ends are attached to the headlight socket housing.