Ford Galaxie Dome Light Bulb Size

The Ford Galaxie dome light utilizes a 1003 bulb size for interior illumination within the cabin area. Data for the specified lighting component covers the period from 1959 to 1967.

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
1959-1967	1003

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003

Other Locations

Additional Notes

The 1003 bulb is the sole dome light bulb specified for the Ford Galaxie across all listed model years, spanning 1959-1967.
The 1003 is an ANSI-standardized bulb, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
It operates on a 12-volt electrical system, which aligns with the standard automotive voltage architecture of the era.
The 1003 carries a 21-watt rating, placing it in the mid-range of incandescent interior bulbs and reflecting typical dome light output levels of the period.
Its single-filament construction means it serves one lighting function only, with no secondary circuit for a reduced-brightness mode.
The BA15s bayonet base uses a single locating pin, distinguishing it from the BA15d base, which has two offset pins. These two base types are not interchangeable despite their similar physical profile.