GMC K1500 Suburban License Plate Bulb Size

The GMC K1500 Suburban license plate light requires 194 and 67 bulb sizes for the various lighting components. Available data covers the range from 1979 through 1999 for the specified vehicle and lighting equipment.

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
1992-1999	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 Suburban uses two distinct bulb types for the license plate position across its model years: the 194 for 1992-1999 and the 67 for 1979-1986.
The 194 is a T10 miniature wedge bulb rated at 12 volts and 3.78 watts, conforming to ANSI standards recognized in both the United States and Canada.
The wedge base design of the 194 means it is held in place by tension from the socket itself, with no separate locking mechanism such as a bayonet or screw fitting.
The 67 is a single-filament bulb rated at 12 volts and 8 watts, also carrying ANSI standardization for the US and Canadian markets.
The 67 uses a BA15s bayonet base, a single-contact fitting that locks into its socket with a quarter-turn motion.
At 8 watts, the 67 draws more than twice the power of the 194 at 3.78 watts, making the two bulbs electrically incompatible as direct substitutes for one another.
The 67 is described as a lower wattage variant of the 1156, which means the two share the same BA15s bayonet base but are not interchangeable due to their differing wattage ratings.
The physical base types of the 194 and 67 are entirely different, a wedge versus a bayonet, so the sockets designed for each generation of the K1500 Suburban are not cross-compatible.