Where is the glow plug fuse on a 2003 E450 Diesel?

On a 2003 E450 Diesel, the glow plug fuse is typically located in the engine compartment's fuse box. You can find the fuse box near the driver's side, near the battery. The specific fuse for the glow plugs is usually labeled in the fuse box cover, so it's best to consult the owner's manual or the diagram on the fuse box for the exact location and rating of the fuse.