Lincoln Aviator Back Up Light Bulb Size

The Lincoln Aviator back up light requires bulb size 2456 or 3156 depending on the specific configuration of the vehicle. Data for the bulb sizes covers the range from 2003 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

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

Other Locations

Additional Notes

The Lincoln Aviator backup light specifications reference two distinct bulb types across the 2003-2005 model years: the 2456 and the 3156, both conforming to ANSI standards recognized in the US and Canada.
Both bulb types operate at 12 volts, making them compatible with standard automotive electrical systems of that era.
The 2456 is a festoon-style bulb intended for specialty applications. Festoon bulbs are cylindrical in form and mount by pressing between two spring contacts at each end, rather than inserting into a socket.
The 3156 is a single-filament wedge bulb of the T25 form factor, rated at 27 watts. Wedge bulbs seat directly into a socket without a separate base, held in place by the tension of the socket itself.
The single-filament design of the 3156 means it serves one switching function only, which is consistent with a dedicated backup light circuit.
The 2004 Lincoln Aviator uses the 3156, while the 2003 and 2005 model years use the 2456. These two bulb types are not interchangeable, as they differ in physical form factor and mounting method.
Because the 2456 and 3156 use fundamentally different mounting systems, a festoon socket and a wedge socket are not physically compatible, and substitution between the two types is not possible without modifying the socket assembly.