Ford Galaxie 500 Map Light Bulb Size

The Ford Galaxie 500 map light uses unique bulb sizes 1003, 214-2, and 631 depending on the specific production period. Available data covers the range from 1962 through 1974.

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
1974	1003
1973	214-2
1967-1970	631
1962-1966	1003

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.	214-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	631

Other Locations

Additional Notes

The bulb 1003 is the most frequently specified map light bulb for the Ford Galaxie 500, appearing across the 1962-1966 model years and again in 1974.
The 1003 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and recognized under ANSI standards in both the US and Canada.
The bulb 631 is specified for the 1967-1970 model years and shares the same BA15s bayonet base, 12V operating voltage, and 21W power rating as the 1003.
The 631 is noted as a variant of the 1156 bulb, which is a widely used automotive single-filament type, though the 631 and 1003 are distinct part numbers and are not listed as interchangeable in these specifications.
Despite the 1003 and 631 sharing identical electrical ratings and the same BA15s base type, the specifications treat them as separate fitments for their respective model years, and substitution between them is not indicated.
The 1973 Ford Galaxie 500 uses the 214-2, a festoon-style bulb measuring 41mm in length with an SV8.5 base, rated at 12V and 12W.
The SV8.5 base of the 214-2 is physically incompatible with the BA15s bayonet base used by both the 1003 and 631, meaning the 1973 fitment requires a distinctly different socket than those used in surrounding model years.
At 12W, the 214-2 draws notably less power than the 21W rating of the 1003 and 631 bulbs, reflecting a difference in bulb technology and construction rather than a shared electrical platform.