Mercury Monterey Map Light Bulb Size

The Mercury Monterey Map Light utilizes bulb sizes 6411, 214-2, 212-2, 1816, 631, 1895, and 81. Available information covers the span from 1953 through 2007.

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
2004-2007	6411
1974	214-2
1972-1973	212-2
1968-1971	1816
1967	631
1966	1816
1962-1965	1895
1953-1955	81

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	214-2
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Miniature wedge bulb (T3.25). 12V, 4W.	1816
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	631
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 0.9W.	1895
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 8W.	81

Other Locations

Additional Notes

The Mercury Monterey map light uses the 1816 bulb across the most model years in these specifications, covering 1966-1970 and 1968-1971, making it the most frequently specified bulb type in this dataset.
The 6411 is a festoon-type bulb with an SV8.5 base, rated at 12V and 5W, with a 36mm length. It is specified for the Mercury Monterey map light across the 2004-2007 model years.
Festoon bulbs, such as the 6411, 214-2, and 212-2, are cylindrical in form and mount by pressing into clips at each end rather than using a socket base, which distinguishes them from wedge and bayonet-type bulbs also present in these specifications.
The 214-2 and 212-2 are both festoon bulbs sharing the same 41mm length, SV8.5 base, 12V rating, and 12W output. The 214-2 is specified for the 1974 model year, while the 212-2 covers 1972-1973.
The 1816 is a miniature wedge bulb of the T3.25 type, rated at 12V and 4W. Wedge bulbs use no separate base, as the glass envelope itself forms the contact points for the socket.
The 631 bulb, specified for the 1967 Mercury Monterey, is a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. It is noted as a variant of the 1156, though at 21W it draws considerably more power than the map light bulbs used in surrounding model years.
The 1895 is a T5 miniature wedge bulb rated at 12V and just 0.9W, making it the lowest-wattage bulb in these specifications. It is specified for the 1962-1965 model years.
The bulb 81 features a BA15s bayonet base and is rated at 12V and 8W. It is specified for the 1953-1955 model years, representing the earliest entries in these specifications.
Despite the physical similarity between the 214-2 and 212-2, including identical length, base type, voltage, and wattage, they carry distinct ANSI designations and are not listed as interchangeable within these specifications.
All bulbs listed across these specifications conform to ANSI standards applicable in both the United States and Canada, and all operate at 12V, consistent with standard automotive electrical systems.