Chevrolet Citation Trunk Bulb Size

The Chevrolet Citation trunk light requires a 1003 bulb size for proper illumination of the rear storage area. Data for the specific component covers the period from 1980 through 1983.

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
1980-1983	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 trunk bulb for the Chevrolet Citation across the 1980-1983 model years.
The 1003 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard used in both the United States and Canada.
The 1003 operates on a 12-volt electrical system and draws 21 watts, which is consistent with a standard incandescent automotive interior or cargo area lighting application.
The 1003 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin. This base type requires a quarter-turn insertion and is not interchangeable with BA15d bases, which carry two offset pins for dual-filament bulbs.
As a single-filament bulb, the 1003 serves one lighting function only, distinguishing it from dual-filament types used in applications requiring both running and braking output from the same housing.