Wiring cables wit electronic trailer control module for cars and campers. Littelfuse wiring kit and trailer control modules are a simple and effective solution for the trailer lights, both on cars and camper, without any load for the vehicle electrical system. Built with technologically innovative and high-quality components which increase the reliability and the long-life of the product. Wiring kit with cables and 7-pole sockets connect perfectly to the vehicle lighting indicator with the trailer. Standards: Conforms to ISO 1724 recommendations and standards Error signal from the car check-control Trailer control modules purpose is the vehicle rear fog light switch off when the trailer is connected and the rear fog function is on. Depending on the trailer control modules type, there can be further and different functions.