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In a Ford F-150, you can find the trailer fuse in the passenger compartment fuse panel. The fuse in slot 4 controls the trailer brake control, which is essential for safely operating trailers with electric brakes. A trailer brake controller utilizes the vehicle's power to determine the amount of braking force applied to the trailer. It's crucial to have a functioning trailer brake controller when towing trailers with electric or electric over hydraulic brakes, especially when the loaded weight exceeds 3,000 pounds in most states.
The Ford F150 trailer fuse can be found in the fuse panel inside the passenger compartment. Specifically, fuse number 4 controls the trailer brake function.