Chevrolet Corvair Trunk Bulb Size

The Chevrolet Corvair trunk light requires a 1003 bulb size for proper illumination within the storage compartment. Available information covers the specific time range from 1960 through 1969.

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
1960-1969	1003

Bulb Specifications

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

Other Locations

Additional Notes

The 1003 is the trunk bulb size specified for the Chevrolet Corvair across all listed model years, spanning 1960-1969.
The 1003 bulb follows the ANSI standard, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
This bulb operates on a 12-volt electrical system, which is consistent with the standard automotive electrical architecture used in passenger vehicles of this era.
At 21 watts, the 1003 produces a moderate light output suitable for an interior illumination application such as a trunk compartment.
The 1003 uses a single-filament design, meaning it serves one lighting function only, with no secondary filament for a reduced-intensity mode.
The BA15s bayonet base is a single-contact bayonet fitting, and the "s" designation indicates the contact pin is centered, distinguishing it from offset-pin variants that are not interchangeable with this socket type.
Because the BA15s base is a specific contact configuration, substituting a bulb with a BA15d (dual-contact) base would result in an incompatible fit even though the physical shell size may appear similar.