The Ford Excursion brake light utilizes a 3457 bulb size for the rear lighting system on the vehicle. Data for the specific component covers the range from 2000 to 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Excursion uses the 3457 bulb for its brake lights across the entire 2000-2005 model range.
The 3457 is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W/7W output, where the higher wattage filament serves the stop function and the lower wattage filament serves a secondary function such as running or turn signal duty.
The dual-filament design of the 3457 means it is not directly interchangeable with single-filament bulbs of similar physical size, as substituting a single-filament type would result in the loss of one lighting function.
The center high mount stop light on the Ford Excursion uses the 912 bulb across the 2000-2005 model range.
The 912 is an ANSI-standard single-filament wedge bulb in the T15 form factor, rated at 12V and 12W.
The 912 is a variant of the 921 bulb, with the primary difference being wattage. The 921 is rated at 16W, making the two types electrically distinct despite their physical similarity.
Because the 912 and 921 share the same T15 wedge base, physical fitment is possible with either type, though the wattage difference means they are not identical replacements from an electrical standpoint.
Both the 3457 and 912 conform to ANSI standards recognized in the United States and Canada, indicating standardized base dimensions and electrical ratings within those markets.