Normal Operation
WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The trailer battery charging is accomplished through the use of the trailer tow battery charge relay. The trailer tow battery charge relay is supplied power and ground through the central junction box (CJB). When energized, the trailer tow battery charge relay routes power from the CJB to the trailer tow connector through circuit 49 (OG).