The Honda Ridgeline is Honda's only truck, and it's designed to pull vehicles behind it using the built-in hitch. The problem is that there's no way to plug in the wiring from the hitch to the trailer. Without that connection, no trailer is legal. To fix the issue, you need to connect a trailer wiring harness to the lighting system of the Ridgeline, which takes about 30 minutes to do properly.
Drop the tailgate on the Ridgeline. Remove the screws holding the taillights in place using the Phillips-head screwdriver and then take the lights away from the body. Unplug the taillight wiring harness with your hands.
Locate the t-connector on the trailer wiring harness with the yellow wire. Install this t-connector between the taillight plug and the wiring harness that leads into the taillight with your hands. Run the remaining sections of the trailer wiring harness under the bumper and around to the underside of the vehicle. Reinstall the driver's side taillight with the Phillips-head screwdriver.
Locate the t- connector on the trailer wiring harness with the green wire. Run this t-connector up through the bumper and out of the hole between the bumper and the body on the passenger side taillight. Plug in the t-connector to the back of the taillight and the wiring harness from the body using your hands. Peel back the tape backing on the back of the black box on this side of the harness. Stick the black box to the inner taillight structure with your hands. Reinstall the passenger side taillight with the Phillips-head screwdriver.
Find the white wire on the trailer wiring harness with the ring terminal on it. Find a piece of steel on the frame to secure the ring terminal. Install the self-tapping screw into the ring terminal and then use the drill to attach the ring terminal to the sheet metal.
Run the trailer plug from the trailer wiring harness to the hitch and hold it there using a zip tie. Bundle up any loose wire and connect it to the frame and bumper with the zip ties.
