Ford Excursion Parking Light Bulb Size

The Ford Excursion parking light requires bulb sizes 3157NA, 2458, or 3157 depending on the specific component needed for the lighting assembly. 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	3157NA
2000-2004	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

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Additional Notes

The Ford Excursion uses the 3157 bulb for parking lights across the 2000-2004 model years, making it the dominant fitment in this specification set.
The 3157 is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament.
The dual-filament design allows a single bulb to serve two brightness levels, which is typical in parking and stop/tail light applications where both a dim running state and a brighter signaling state are required.
For the 2005 model year, the Ford Excursion specifies the 3157NA variant instead of the standard 3157.
The 3157NA shares the same ANSI classification, T25 form factor, and 12V/27W/7W electrical ratings as the 3157, with the sole distinction being its natural amber glass envelope.
The "NA" designation in 3157NA refers to the natural amber tint of the glass, which produces an amber-colored output without the use of an external lens or colored housing.
Although the 3157 and 3157NA are physically and electrically identical, substituting a clear 3157 in a 2005 application may not replicate the amber output intended by the factory specification.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of performance and dimensional criteria for those markets.