Ford Zephyr Map Light Bulb Size

The Ford Zephyr map light requires a bulb size of 63 for the interior lighting component. Data for the specified vehicle covers the range from 1953 to 1955.

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
1953-1955	63

Bulb Specifications

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

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Additional Notes

The Ford Zephyr uses the ANSI 63 bulb for its map light across the 1953-1955 model years.
The ANSI 63 is a single-filament bulb rated at 12 volts and 0.63 watts, making it a low-draw interior lighting component.
The 63 bulb uses a BA9s base, a miniature bayonet cap fitting common in small-cavity interior lamp housings.
The BA9s base type is not interchangeable with screw-base or wedge-base bulbs without a socket adapter, as the bayonet mounting relies on a twist-lock pin configuration.
The ANSI 63 designation is recognized under US and Canadian standards, meaning the bulb specification applies to both markets.