GMC K1500 License Plate Bulb Size

The GMC K1500 license plate light uses 194 and 67 bulb sizes depending on the specific production period for the vehicle. Available information covers the time range from 1979 through 1999.

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
1988-1999	194
1979-1986	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 K1500 uses two distinct bulb types for the license plate position across its model years: the 194 and the 67.
The 194 bulb is the license plate bulb for the GMC K1500 from 1988-1999.
The 67 bulb serves the same position on the K1500 for model years 1979-1986.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards for the US and Canadian markets.
The 67 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 8W, also conforming to ANSI standards for the US and Canadian markets.
The BA15s bayonet base of the 67 bulb is physically incompatible with the wedge socket used by the 194, making the two types non-interchangeable despite sharing the same 12V operating voltage.
The 67 bulb is a lower wattage variant of the 1156 bulb, drawing 8W compared to the 3.78W of the 194, meaning the two types differ substantially in power consumption as well as base design.