GMC S15 License Plate Bulb Size

The GMC S15 license plate light uses 67 and 194 bulb sizes according to the provided technical data. Information for the specified vehicle covers the period from 1982 through 1990.

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
1990	67
1987-1989	194
1986	67
1985	194
1984	67
1982-1983	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The GMC S15 license plate bulb specifications cover model years 1982 through 1990, with two distinct bulb types used across that span: the 67 and the 194.
The 194 is the more frequently specified bulb across the S15 lineup, appearing in six of the nine model years covered: 1982, 1983, 1985, and 1987-1989.
The 194 is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 3.78W. Its wedge base design means it is held in place by the socket itself rather than by a separate locking mechanism.
The 67 bulb is specified for the 1984, 1986, and 1990 GMC S15 model years.
The 67 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 8W. The BA15s base uses a single pin and a twist-lock retention method.
At 8W, the 67 draws more than twice the wattage of the 194, which means the two bulb types are not interchangeable despite both being 12V units.
The 67 is described as a lower wattage variant of the 1156 bulb. Both share the BA15s bayonet base, though the 1156 operates at a significantly higher wattage, making the 1156 a non-equivalent substitute for license plate applications.
Both the 67 and the 194 conform to ANSI standards recognized in the United States and Canada, placing them within a standardized North American automotive lighting framework.
Because the S15 alternates between the 67 and the 194 across different model years, the base type and wattage rating of the socket must correspond to the correct specification for each individual year before a replacement bulb is fitted.