Lincoln Mark VIII Back Up Light Bulb Size

The Lincoln Mark VIII back up light utilizes bulb sizes 3156, 2356, and 2456 for the rear illumination system. Data for the specific lighting components covers the range from 1993 to 1998.

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
1998	3156
1996-1997	2356
1995	3156
1994	2356
1993	2456

Bulb Specifications

Description	Bulb Size
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
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456

Other Locations

Additional Notes

The Lincoln Mark VIII backup light specifications reference three distinct ANSI-standard bulb types across the 1993-1998 model years: the 3156, 2356, and 2456.
The 3156 is a single-filament wedge bulb in the T25 form factor, rated at 12V and 27W. Its wedge base design means it seats directly into a socket without a separate metal base.
The 2356 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V. The BAY15d base features two pins offset at different heights, which physically prevents incorrect installation.
The 2456 is a festoon-style bulb rated at 12V, noted as a specialty application type. Festoon bulbs are cylindrical and mount by contact pressure at each end rather than by a base socket.
The Lincoln Mark VIII (1994, 1996-1997) uses the 2356, while the 1995 and 1998 model years use the 3156. The 1993 model year uses the 2456.
The 3156 and 2356 are not interchangeable. The 3156 uses a wedge base, while the 2356 uses a BAY15d bayonet base, making the two physically incompatible with each other's sockets.
The 2356 is a dual-filament bulb, whereas the 3156 is single-filament. Using a single-filament bulb in a socket designed for a dual-filament type can result in incomplete circuit function.
All three bulb types listed carry ANSI standardization applicable in both the United States and Canada, meaning they conform to a defined set of electrical and physical specifications within those markets.