Ford Crestline License Plate Bulb Size

The Ford Crestline uses a size 63 bulb for the license plate light location. Data for the bulb application 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

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

The Ford Crestline uses the 63 bulb for the license plate position across all listed model years, spanning 1950-1954.
The 63 bulb follows the ANSI standard, which is the recognized specification system for automotive bulbs in the United States and Canada.
This bulb operates on a 12-volt electrical system, consistent with the 12V DC architecture standard in automotive applications of that era.
At 0.63 watts, the 63 bulb draws minimal current, which is typical for a license plate illumination application where low power consumption is expected.
The 63 bulb uses a BA9s base, a miniature bayonet-style fitting with a 9mm cap width and a single locating pin, which determines physical socket compatibility.
As a single-filament bulb, the 63 has one light-producing element, meaning it serves only one lighting function with no secondary circuit for dimming or signaling.
The BA9s base type is a widely produced standard, though substitution with physically similar bulbs of differing wattage or voltage ratings would fall outside the listed specification for the Ford Crestline (1950-1954).