Ford Crestline Dome Light Bulb Size

The Ford Crestline dome light requires a bulb size of 63 for proper illumination within the interior cabin area. Data for the specific bulb requirements covers the range from 1950 to 1954.

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
1950-1954	63

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 0.63W.	63

Other Locations

Additional Notes

The Ford Crestline uses the 63 bulb for the dome light across all listed model years, spanning 1950-1954.
The 63 is an ANSI-standardized bulb type, meaning its specifications conform to a defined industry standard recognized in both the United States and Canada.
The 63 bulb operates on a 12-volt electrical system, which is consistent with the 12V automotive standard that became widespread in passenger vehicles during the early 1950s.
At 0.63 watts, the 63 bulb draws very little power, a characteristic typical of interior courtesy lighting where prolonged use without the engine running is common.
The 63 bulb uses a BA9s base, which is a miniature bayonet-style fitting with a 9mm cap and a single locating pin, distinguishing it from double-contact bayonet bases used in other automotive applications.
The single-filament construction of the 63 bulb means it serves one lighting function only, with no provision for dual-intensity operation such as that found in combination stop and tail bulbs.
The BA9s base type is not interchangeable with other common automotive bases such as the wedge base or the bayonet B15 base, and substitutions using physically different base types would not be compatible with the Ford Crestline dome light socket.