Trailer Battery Charging

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For vehicles equipped with push-button start, the trailer battery charging output is disabled when the drivers door is ajar.

The trailer battery relay is energized when the BCM provides ground when both of the following are true:

the ignition is on
the BCM load shed strategy is not active (a message will be displayed in the instrument cluster, such as "Low Battery Features Temporarily Turned Off" or "Turn Power Off To Save Battery", to indicate that BCM load shed strategy is active)

When the BCM energizes the trailer battery relay, the relay provides fused protected voltage directly to the trailer tow connector.