Chevrolet Chevette Engine Compartment Light Bulb Size

The Chevrolet Chevette engine compartment light requires either a 1156 or 1003 bulb size depending on the specific vehicle configuration. The replacement chart covers vehicle production years spanning 1976 to 1986.

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
1985-1986	1156
1980-1983	1156
1978-1979	1003
1976	1003

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.	1003

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Additional Notes

The Chevrolet Chevette engine compartment light uses two distinct bulb sizes across its model years: the 1156 and the 1003.
Both the 1156 and 1003 are ANSI-standardized bulb types recognized in the United States and Canada.
Each bulb type is a single-filament design, meaning it serves one lighting function rather than combining two functions within a single housing.
Both bulb types share the BA15s bayonet base, a single-contact bayonet fitting with a 15mm base width, which is a common base style in automotive applications.
The 1156 and 1003 are electrically identical in the specifications provided, each rated at 12 volts and 21 watts.
Despite their shared electrical ratings and identical base type, the 1156 and 1003 carry different ANSI designations, and substituting one for the other without confirming physical fitment compatibility is not advised.
The Chevrolet Chevette used the 1003 bulb for the engine compartment light during the 1976-1979 model years.
Starting with the 1980 model year, the Chevette transitioned to the 1156 bulb for the engine compartment light, a specification that continued through the 1986 model year.