Plymouth Cambridge License Plate Bulb Size

The Plymouth Cambridge license plate light requires a 63 bulb size for proper illumination. Data for the specified component covers the period from 1951 through 1953.

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
1951-1953	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 bulb type 63 is an ANSI-standardized single-filament bulb rated at 12 volts and 0.63 watts, fitted with a BA9s base, which is a miniature bayonet cap common in low-current indicator and license plate applications.
The Plymouth Cambridge uses the type 63 bulb for its license plate position across the 1951-1953 model years.
The BA9s base is a miniature single-pin bayonet fitting, and substituting a bulb with a different base type, such as a wedge or festoon base, would be physically incompatible with the socket.
At 0.63 watts, the type 63 draws very little current, which is consistent with its role as a license plate illumination source rather than a primary lighting element.