This gadget is {an electrical} diagnostic instrument used to judge 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 proper sign for lighting, brakes, and auxiliary energy. As an example, a unit can affirm if the left flip sign on the trailer is receiving energy from the tow automobile’s corresponding pin.
Efficient use of such a instrument ensures protected and authorized towing operations. Functioning trailer lights and brakes are essential for visibility and management, significantly throughout inclement climate or at night time. Common testing can establish wiring faults, stopping potential accidents and dear repairs. This expertise has advanced from easy continuity testers to extra refined models that may simulate load situations, offering a extra correct evaluation of {the electrical} system.