Rewire your trailer lights and brakes with a Jammy J-JBC 7-way junction box. Keep your wiring clean and organized with a junction box. 7 colored terminals simplify wiring. Access port plugs and rubber grommets included. 6 3/4″ length x 3 1/2″ width. Plastic box with lid that screws on. See 7-way wiring diagram below for wiring.