Ford Galaxie 500 Back Up Light Bulb Size

The Ford Galaxie 500 back up light uses 1156, P21W, and 1141 bulb sizes according to the provided data. The information covers the range from 1962 through 1974.

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
1964-1974	1156
1963	1141
1962	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141

Other Locations

Additional Notes

The Ford Galaxie 500 uses the 1156 bulb for the back up light across the 1962 and 1964-1974 model years.
The 1156 is an ANSI-standardized bulb rated at 12 volts and 21 watts, built around a single filament and a BA15s bayonet base.
The BA15s bayonet base features a single contact pin, which is the defining physical characteristic that distinguishes it from dual-pin bayonet variants.
The 1963 Ford Galaxie 500 uses the 1141 bulb rather than the 1156 found in the surrounding model years.
The 1141 shares the same ANSI classification, BA15s bayonet base, 12-volt rating, and 21-watt output as the 1156, making the two electrically equivalent.
Despite their electrical equivalence, the 1156 and 1141 are distinct ANSI part numbers, and fitment should follow the specification for each individual model year rather than assuming interchangeability across all years.
Both bulb types carry ANSI standardization applicable to the United States and Canada, meaning they conform to a defined set of performance and dimensional criteria within those markets.
A single-filament construction, shared by both the 1156 and 1141, means each bulb serves only one lighting function, which is consistent with the dedicated role of a back up light.