GMC G15 License Plate Bulb Size

The GMC G15 license plate light uses a unique 97 bulb size for illumination purposes. Data for the specified lighting component covers the range from 1975 to 1978.

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
1975-1978	97

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The GMC G15 uses the bulb size 97 for its license plate position across the 1975-1978 model years.
The 97 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification accepted in both the United States and Canada.
The 97 is a single-filament bulb, which is typical for non-signaling lighting positions such as license plate illumination, where variable brightness is not required.
The 97 bulb uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place rather than threaded.
The 97 operates at 12 volts and 13 watts, consistent with standard 12-volt automotive electrical systems.
The 97 bulb is noted as a variant of the 1156, meaning the two share a related design lineage, though they are not confirmed as direct drop-in replacements for one another in this application.