Molded Nylon 7-way Elbow ConnectorThe 7-Pole Junction Box provides a fast, simplified way of connecting wires from the trailer cord to the trailer wiring.It is an excellent area for trouble shooting by offering a single connection point. The junction box is made of heavy plastic and includes hardware, 4 closed and 4 open rubber fitted grommets making it weather proof and corrosion resistant. The above Diagram is instructions on how to wire vehicles for towing. Some manufactures use a different wire setup than listed above. It is recommended that you use a test light to ascertain charges before wiring a vehicle. It is also recommended that you check with the manufacturer or dealership for vehicle specific information before you start wiring.