On a 7-way plug, which pin is designated for ground power supply?

In a 7-way plug, the designation of pins is standardized for specific functions. Pin 1, which is typically the white wire, is designated for the ground power supply. This pin serves a crucial role as it is essential for safe operation, providing a return path for electrical current and helping to prevent electrical shock or short circuits.

The ground connection is vital in towing applications, where ensuring a proper and safe electrical connection between the towing vehicle and trailer is crucial. Pin 1’s role as the ground is consistent across various industry standards, making it reliable for inspections and installations.

The other pins serve different purposes, such as providing power to the brakes, tail lights, and turn signals. Understanding the function of each pin is essential for anyone working with or inspecting trailer electrical systems, as it ensures both safety and compliance with electrical standards.