Mercury Capri Dome Light Bulb Size

The Mercury Capri dome light utilizes bulb sizes 194, 912, 906, and 89 depending on the specific version of the vehicle. Available information covers a span of time starting in 1970 and ending in 1994.

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
1994	194
1991-1993	912
1985-1986	912
1984	906
1983	912
1979-1982	906
1970-1977	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The Mercury Capri dome light draws from four distinct bulb types across its model years: the 194, 912, 906, and 89, all of which conform to ANSI standards recognized in the United States and Canada.
The 912 is a T15 wedge bulb rated at 12V and 12W, and it is the most frequently specified dome light bulb for the Mercury Capri, appearing in the 1983, 1985-1986, and 1991-1993 model years.
The 906 is a T10 miniature wedge bulb rated at 12V and 8W, specified for the 1979-1982 and 1984 model years.
Although the 906 and 194 share the same T10 wedge form factor, they differ significantly in wattage. The 906 draws 8W while the 194 draws only 3.78W, which makes them non-interchangeable despite their physical similarity.
The 912 is a variant of the 921 bulb. While these two types are often considered interchangeable in general automotive use, the specifications for the Mercury Capri list the 912 specifically.
The 89 bulb uses a BA15s bayonet base rather than a wedge base, making it physically incompatible with sockets designed for T10 or T15 wedge bulbs. It is rated at 12V and 13W.
The 89 is described as a lower wattage variant of the 1156 bulb. Both share the BA15s single-contact bayonet base, though the 1156 operates at a higher wattage and the two are not rated as direct substitutes.
The 89 bulb was specified for the Mercury Capri dome light across the 1970-1977 model years, representing the earliest generation covered by these specifications.
The 1994 Mercury Capri uses the 194 bulb, a T10 miniature wedge type rated at 12V and 3.78W, which is the lowest wattage of all four bulb types listed across the model range.
The transition from the bayonet-base 89 to wedge-base bulb types reflects a socket design change between the 1977 and 1979 model years, as the 906 wedge type appears beginning with the 1979 model year.