Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
When the trailer tow LH turn relay is energized, power is routed from circuit 175 (BK/YE) to the trailer tow connector through circuit 52 (YE). When circuit 374 (DB/WH) is supplied power from the multifunction switch (such as when the brakes are applied), the relay is energized.