Lincoln Mark VII Dome Light Bulb Size

The Lincoln Mark VII dome light uses bulb sizes 906 and 912 for interior illumination. Data for the specified lighting components covers the period from 1984 through 1992.

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
1992	906
1990-1991	912
1986-1988	912
1984	912

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912

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Additional Notes

The Lincoln Mark VII dome light specifications reference two bulb types across its model years: the 906 and the 912.
The 912 is a T15 wedge bulb rated at 12V and 12W, conforming to the ANSI standard for the US and Canadian markets.
The 906 is a T10 miniature wedge bulb rated at 12V and 8W, also conforming to the ANSI standard for the US and Canadian markets.
The 912 is noted as a variant of the 921 bulb, which shares the same T15 wedge base but differs in wattage, making direct substitution a consideration dependent on the specific application.
The 912 bulb is the dominant fitment across the Lincoln Mark VII dome light application, covering the 1984-1988 and 1990-1991 model years.
The 1992 Lincoln Mark VII dome light uses the 906 bulb rather than the 912, representing a lower wattage fitment at 8W compared to the 12W rating of the 912.
The T10 and T15 designations refer to the tubular bulb body size, with T10 indicating a smaller envelope than the T15, meaning the two bulb types are physically non-interchangeable despite both using a wedge base.
The wattage difference between the 906 (8W) and the 912 (12W) reflects a difference in power draw, which is relevant to socket and circuit compatibility.