Which fuse is for the trailer running lights?

The fuse for the trailer running lights typically varies depending on the vehicle's make and model. You can usually find the specific fuse in the owner's manual or on the fuse box cover, often labeled as "Trailer Lights," "Tow Package," or similar. It's usually located in the engine compartment or under the dashboard. If you're unsure, consulting the vehicle's manual or a professional is recommended.