Ford EXP Map Light Bulb Size

The Ford EXP map light uses bulb size 906 and bulb size 1816 for illumination. Available information covers the period from 1982 through 1988 for the specified vehicle components.

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
1985	906
1982-1984	1816

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

Other Locations

Additional Notes

The Ford EXP map light specifications cover model years 1982-1988 and reference two distinct bulb types: the 906 and the 1816.
Both the 906 and 1816 are ANSI-standard miniature wedge bulbs rated at 12 volts, making them compatible with standard automotive electrical systems in the United States and Canada.
The 906 bulb follows the T10 wedge form factor, while the 1816 follows the smaller T3.25 form factor. These two profiles are not interchangeable despite sharing the same wedge base style.
The 906 is rated at 8 watts, and the 1816 is rated at 4 watts, meaning the 906 produces a notably higher light output for the map light application.
Ford EXP model years 1987 and 1988, along with 1985, use the 906 bulb for the map light position.
Ford EXP model years 1982-1984 use the 1816 bulb for the map light position.
A gap exists in the listed specifications for the 1986 model year, and no bulb size is attributed to it in the provided data.
The shift from the 1816 to the 906 between the 1984 and 1985 Ford EXP represents a change in both physical bulb size and wattage output for the map light circuit.
Because the T10 and T3.25 wedge bases differ in physical size, installing a 906 in a socket designed for the 1816, or vice versa, risks a poor fit or failure to make proper electrical contact.