Mercury Capri Map Light Bulb Size

The Mercury Capri map light requires bulb sizes 912, 105, 906, or 1816 depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1979 to 1993.

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
1991-1993	912
1982-1986	105
1981	906
1980	1816
1979	906

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
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Miniature wedge bulb (T3.25). 12V, 4W.	1816

Other Locations

Additional Notes

The Mercury Capri map light bulb specifications span model years 1979 through 1993, with four distinct bulb types used across that period: the 912, 105, 906, and 1816.
The 912 bulb is the most frequently specified type in the later production years, covering the Mercury Capri from 1991-1993. It is a T15 wedge bulb rated at 12V and 12W, conforming to ANSI standards for the US and Canadian markets.
The 912 is a variant of the 921 bulb. These two types share the same wedge base and general form, though they differ in wattage, which makes cross-compatibility a consideration when sourcing replacements.
The 105 bulb is specified for the widest consecutive range of model years, covering 1982-1986. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W, and is classified as a variant of the 1156.
The BA15s bayonet base of the 105 bulb is a single-contact fitting, meaning it is not interchangeable with dual-contact bayonet bases without a physical mismatch at the socket.
The 906 bulb is a T10 miniature wedge type rated at 12V and 8W. It is specified for two non-consecutive model years, 1979 and 1981, indicating it was not used in an unbroken production run.
The 1816 bulb is a T3.25 miniature wedge type rated at 12V and 4W, the lowest wattage among all four bulb types in these specifications. It is listed exclusively for the 1980 Mercury Capri map light.
The wattage variation across the four bulb types ranges from 4W to 13W. Because socket terminals and housing tolerances are often matched to specific wattage and base types, substituting one bulb type for another across these specifications carries a risk of fitment or electrical incompatibility.
All four bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating a shared regulatory classification across the full range of model years covered.
The T15, T10, and T3.25 designations refer to the tubular envelope size of each wedge bulb, with the numerical portion representing the width in eighths of an inch. The 1816 T3.25 bulb is therefore notably smaller in envelope size than the 912 T15 bulb.