Ford Excursion Back Up Light Bulb Size

The Ford Excursion back up light utilizes bulb sizes 2456, 3156, and 2356 depending on the specific version of the vehicle. Data for the bulb sizes 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.

Bulb Size by Year Range

Years	Bulb Size
2005	2456
2004	3156
2003	2456
2002	2356
2001	2456
2000	2356

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2356

Other Locations

Additional Notes

The Ford Excursion backup light specifications cover model years 2000-2005 and reference three distinct bulb types across that span: the 2456, 3156, and 2356.
All three bulb types listed in these specifications conform to ANSI standards recognized in both the United States and Canada, and all operate at 12 volts.
The 2456 is a festoon bulb rated for specialty applications. It is the specified backup light bulb for the Ford Excursion in 2001, 2003, and 2005.
The 3156 is a single-filament wedge bulb of the T25 form factor, rated at 27 watts. It is specified exclusively for the 2004 model year.
The 2356 is a dual-filament bulb with a BAY15d bayonet base. It is specified for the 2000 and 2002 model years.
The BAY15d bayonet base of the 2356 is a two-pin offset base, a design that physically prevents incorrect insertion. This base type is common in bulbs where two filaments serve separate lighting functions.
The festoon form factor of the 2456 differs structurally from both the wedge base of the 3156 and the bayonet base of the 2356, meaning none of the three bulb types are physically interchangeable with one another.
The dual-filament construction of the 2356 distinguishes it functionally from the single-filament 3156, even though both are used in the same backup light position across different model years of the Ford Excursion.
The backup light bulb specification changed across consecutive model years, with the 2000-2005 range reflecting at least four separate specification changes, indicating that year-specific verification is necessary before bulb replacement.