All 12 volt wiring is completely weather protected with no direct exposure to the elements or road hazards. The molded, 4-wire cable is routed inside the tubular main rail. All brake wiring is run through a conduit into a welded channel on the axle. In addition, all circuitry is distributed from an easily accessible interior junction box. Primary connections are made with wire nuts. There are no hidden splices. All wiring is SAE truck/trailer color coded wire with one central location for all troubleshooting.