Chevrolet Chevy II Trunk Bulb Size

The Chevrolet Chevy II trunk light utilizes a 1003 bulb size for illumination within the rear storage compartment. Data for the specific component covers the period from 1962 through 1968.

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 Type	Shop
1962-1968	1003	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003	Check Price

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Additional Notes

The 1003 bulb is the sole trunk bulb type specified for the Chevrolet Chevy II across all listed model years, covering 1962-1968.
The 1003 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, into a single unit.
The 1003 operates at 12 volts and draws 21 watts, which is consistent with standard automotive electrical systems of that era.
The 1003 uses a BA15s bayonet base, a single-contact bayonet fitting in which the "s" denotes a single contact pin at the base.
The 1003 is an ANSI-standardized bulb recognized in both the United States and Canada, placing it within a defined North American specification framework.
Because the same bulb number applies without variation across all seven listed model years of the Chevrolet Chevy II, the trunk lighting socket and electrical requirements remained consistent throughout that production span.
The BA15s base is not interchangeable with the BA15d base, which carries two contact pins. Substituting a dual-contact bulb in a single-contact socket would result in improper fitment.