Chevrolet LUV Back Up Light Bulb Size

The Chevrolet LUV back up light requires bulb sizes 1156 and P21W according to the provided specifications for the vehicle. Data for the bulb sizes covers the range from 1975 to 1982.

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
1975-1982	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the sole back up light bulb size listed for the Chevrolet LUV across all model years covered in the specifications, spanning 1975-1982.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American standard recognized in both the United States and Canada.
The 1156 operates on a 12-volt electrical system, which is consistent with standard automotive DC voltage found in passenger vehicles and light trucks of that era.
At 21 watts, the 1156 produces a relatively high output for an incandescent automotive bulb, a characteristic that suits its role in back up lighting where visibility is a functional requirement.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design corresponds directly to the bulb's single-filament construction.
Because the 1156 is a single-filament bulb, it serves one dedicated lighting function per socket, as opposed to dual-filament types such as the 1157, which serve two functions from a single housing.
The BA15s base is not interchangeable with the BA15d base. The BA15d is a dual-contact bayonet fitting used with dual-filament bulbs, and substituting one for the other is not electrically or physically compatible.
The 1156 shares its BA15s base with certain other single-filament bulb types, but wattage and voltage ratings must match the original specification before any substitution is considered valid for a given application.