Trailer Battery Charging
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The Trailer Module (TRM) provides voltage to the trailer tow connector for trailer battery charging when the ignition switch is in the RUN position.
The Trailer Module (TRM) is supplied voltage for trailer battery charging from the BJB.