This system is {an electrical} diagnostic device used to guage the performance of the connection between a automobile and a trailer. It checks the integrity of the seven-pin connector, verifying that every circuit supplies the right sign for lighting, brakes, and auxiliary energy. For example, a unit can verify if the left flip sign on the trailer is receiving energy from the tow automobile’s corresponding pin.
Efficient use of such a device ensures secure and authorized towing operations. Functioning trailer lights and brakes are crucial for visibility and management, notably throughout inclement climate or at evening. Common testing can establish wiring faults, stopping potential accidents and dear repairs. This expertise has advanced from easy continuity testers to extra subtle models that may simulate load circumstances, offering a extra correct evaluation of {the electrical} system.