Which pin on a 7-way plug provides power supply for the stop and antilock functions?

The pin that provides the power supply for the stop and antilock functions in a 7-way plug is indeed the red pin. This connection is critical for the proper operation of the trailer's braking system and antilock brake system (ABS).

The 7-way plug is commonly used in towing applications to supply necessary electrical signals between the towing vehicle and the trailer. Each pin in the connector is designated for a specific function, and understanding these functions ensures safe towing.

In this context, the red pin is responsible for carrying power to the stop lights. When the towing vehicle's brakes are applied, this pin activates the stop lights on the trailer, alerting other drivers that the vehicle is slowing down or stopping. Additionally, it plays a role in the antilock braking system, which prevents wheel lockup during braking, improving vehicle control and safety.

Understanding these pin functions is crucial for those involved in trailer maintenance, inspection, or safe towing practices.