Lincoln Mark VI Back Up Light Bulb Size

The Lincoln Mark VI back up light requires bulb sizes 1156 and P21W according to the provided specifications for the lighting system. Data for the bulb sizes covers the range from 1980 to 1983.

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
1980-1983	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Lincoln Mark VI uses the 1156 bulb for the back up light across all documented model years, spanning 1980-1983.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated role as a back up light.
The 1156 operates at 12 volts and 21 watts, placing it within the standard low-voltage automotive electrical range.
The 1156 uses a BA15s bayonet base, a single-contact bayonet mount that locks into the socket with a twist and is not interchangeable with dual-contact bayonet variants such as the BA15d.
The 1156 designation follows ANSI standards recognized in both the United States and Canada, indicating a standardized specification rather than a proprietary one.