GMC G1500 License Plate Bulb Size

The GMC G1500 license plate light uses bulb sizes 194 and 67 for the rear exterior illumination components. Available data for the specified vehicle covers the range from 1979 through 1995.

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
1995	194
1979-1994	67

Bulb Specifications

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

Other Locations

Additional Notes

The GMC G1500 license plate bulb specifications cover model years 1979 through 1995, with two distinct bulb types used across that span.
The bulb 67 is the predominant license plate bulb in these specifications, appearing in the GMC G1500 across 1979-1994.
The 67 bulb follows the ANSI standard recognized in both the United States and Canada, operating at 12 volts and drawing 8 watts.
It uses a BA15s bayonet base, which is a single-contact base that locks into its socket with a twist-and-push motion, distinguishing it from friction-fit or screw-type bases.
The 67 bulb is a lower-wattage variant of the 1156 bulb, meaning the two share the same BA15s bayonet base but differ in wattage output, which makes them physically similar yet electrically distinct.
For the 1995 model year, the GMC G1500 license plate bulb specification changes to the 194, a T10 miniature wedge bulb operating at 12 volts and 3.78 watts.
The 194 bulb uses a wedge-style base rather than a bayonet fitting, meaning it is held in place by the socket's contact pressure alone and is not interchangeable with the BA15s-based 67 bulb.
At 3.78 watts, the 194 draws considerably less power than the 8-watt 67, reflecting a meaningful difference in electrical load between the two bulb types.
The shift from the 67 to the 194 between the 1994 and 1995 model years represents a change in both base type and wattage, so the two bulbs are not interchangeable despite serving the same license plate lighting function.
Both the 67 and the 194 conform to ANSI standards applicable in the United States and Canada.