Ford P-350 Dome Light Bulb Size

The Ford P-350 dome light requires bulb size 1003 or 81 depending on the specific application for the interior lighting system. Data for the bulb specifications covers the range from 1952 through 1957.

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
1956-1957	1003
1952-1955	81

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 8W.	81

Other Locations

Additional Notes

The Ford P-350 dome light draws from two ANSI-standard bulb types across its 1952-1957 model years: the 1003 and the 81.
Both the 1003 and the 81 are single-filament bulbs rated at 12 volts and share the BA15s bayonet base, a single-contact base with a 15mm collar.
The 1003 is rated at 21 watts, while the 81 is rated at 8 watts, placing them in notably different output categories despite their shared base type.
The BA15s bayonet base is physically compatible between the two bulb types, though the wattage difference means the 1003 and the 81 are not functionally interchangeable as direct replacements.
The Ford P-350 used the 81 bulb for its dome light across the 1952-1955 model years.
The 1003 bulb replaced the 81 in the Ford P-350 dome light position for the 1956-1957 model years, representing a shift to a higher-wattage unit.