Mercury Comet Back Up Light Bulb Size

The Mercury Comet back up light utilizes 1076, 1156, P21W, 1141, and 1073 bulb sizes depending on the specific version. Available information covers the range from 1960 through 1977.

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
1975-1977	1076
1974	1156
1971-1973	1076
1964-1969	1156
1963	1141
1961-1962	1073
1960	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 8W.	1076
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	1073

Other Locations

Additional Notes

The Mercury Comet backup light specifications span model years 1960-1977, with four distinct bulb types used across that period: the 1076, 1156, 1141, and 1073.
All four bulb types in these specifications share the same BA15s bayonet base and operate at 12 volts, classifying them as single-filament ANSI-standard bulbs recognized in both the United States and Canada.
The 1156 is the most frequently specified bulb across the Mercury Comet's model year range, appearing in the 1960, 1964-1969, and 1974 model years.
The 1076 is the second most common specification, covering the 1971-1973 and 1975-1977 model years. It is a variant of the 1156 but draws significantly less power at 8 watts compared to the 1156's 21 watts.
Because the 1076 and 1156 share the same BA15s bayonet base, they are physically interchangeable, but their wattage difference is a relevant electrical consideration when substituting one for the other in the Mercury Comet.
The 1073 was specified exclusively for the 1960-1961 model years of the Mercury Comet. It is a lower-wattage variant of the 1156, rated at 13 watts, and shares the same BA15s base.
The 1141 was specified solely for the 1963 Mercury Comet. It shares the same 12V, 21-watt rating as the 1156 and uses the identical BA15s bayonet base, making the two electrically equivalent.
Despite the physical and electrical similarities among these four bulb types, substituting across specifications without confirming compatibility with the intended model year is not advisable, as wattage differences can affect circuit load and lens performance.