Ford EXP Dome Light Bulb Size

The Ford EXP dome light requires 906 and 1816 bulb sizes for the interior illumination system. Data for the specific components covers the period from 1982 through 1988.

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
1987-1988	906
1986	1816
1982-1985	906

Bulb Specifications

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

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Additional Notes

The Ford EXP dome light specifications cover model years 1982-1988 and reference two distinct bulb types: the 906 and the 1816.
The 906 bulb is the predominant fitment across the Ford EXP dome light application, appearing in six of the seven model years listed.
Both the 906 and 1816 are ANSI-standardized miniature wedge bulbs rated at 12 volts, making them compatible with standard automotive electrical systems.
The 906 bulb follows the T10 wedge form factor and draws 8 watts, classifying it as a higher-output option within the miniature wedge category.
The 1816 bulb follows the T3.25 wedge form factor and draws 4 watts, representing a lower-output variant relative to the 906.
The T10 and T3.25 designations refer to the tubular envelope width of each bulb, expressed in eighths of an inch, meaning the 906 has a physically wider envelope than the 1816.
The 1986 Ford EXP uses the 1816 bulb rather than the 906, making it the sole model year in this range with a different dome light fitment.
Because the 906 and 1816 differ in both form factor and wattage, the two bulb types are not interchangeable across model years without accounting for socket compatibility and power draw differences.