Lincoln Mark VII Map Light Bulb Size

The Lincoln Mark VII map light requires bulb size 912 or 105 depending on the specific vehicle configuration. Data for the provided bulb sizes covers the range from 1984 to 1992.

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
1985-1992	912
1984	105

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	105

Other Locations

Additional Notes

The Lincoln Mark VII map light bulb specifications cover the 1984-1992 model years.
The 912 bulb is the map light fitment for the 1985-1992 Mark VII, making it the predominant bulb across this application.
The 912 is a T15 wedge-base bulb rated at 12 volts and 12 watts, conforming to ANSI standards recognized in both the United States and Canada.
The 912 is a variant of the 921 bulb, meaning the two share the same T15 wedge base and general form factor, though they differ in wattage output.
The 1984 Lincoln Mark VII map light takes the 105 bulb, which differs from the 912 in both base type and wattage.
The 105 uses a BA15s single-contact bayonet base, which is physically incompatible with the wedge socket used by the 912, making the two bulbs non-interchangeable.
The 105 is rated at 12 volts and 13 watts, placing it slightly higher in wattage than the 912.
The 105 is a variant of the 1156 bulb and shares its BA15s bayonet base, though the 1156 is typically rated at a higher wattage and is more commonly associated with exterior signal lighting.