Ford LTD II Map Light Bulb Size

The Ford LTD II map light requires bulb size 1003 or 211-2 depending on the specific configuration of the interior lighting component. Data for the requested bulb sizes covers the period from 1977 through 1979.

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
1978-1979	1003
1977	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The Ford LTD II map light uses two distinct bulb types across its model years: the 1003 and the 211-2, both of which are ANSI-standard bulbs rated for use in the United States and Canada.
The 1003 bulb is a single-filament type mounted on a BA15s bayonet base, operating at 12 volts and drawing 21 watts.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with dual-contact bayonet variants such as the BA15d.
The 211-2 is a festoon-style bulb with an SV8.5 base, a 41mm length, and a 12-volt, 12-watt rating.
Festoon bulbs make contact at each end of the housing rather than through a base pin or bayonet collar, making the 211-2 physically and electrically incompatible with the BA15s socket used by the 1003.
The Ford LTD II (1978-1979) takes the 1003 bulb for the map light, while the 1977 model year uses the 211-2.
The wattage difference between the two bulbs is notable: the 1003 draws 21 watts, whereas the 211-2 draws only 12 watts, meaning the two types are not electrically equivalent even if a physical adapter were used.