GMC K2500 Suburban License Plate Bulb Size

The GMC K2500 Suburban license plate light requires bulb sizes 194 and 67 for proper illumination. Provided information covers the specific time range from 1979 through 1999 for the specified vehicle.

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 K2500 Suburban uses two distinct license plate bulb types 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 retained by friction alone, with no separate metal base or locking mechanism required for installation.
The 67 is a single-filament bulb rated at 12 volts and 8 watts, also conforming to ANSI standards recognized in both the United States and Canada.
The 67 uses a BA15s bayonet base, a single-contact fitting where the bulb is inserted and rotated to lock into place.
The 67 is classified as a lower wattage variant of the 1156 bulb family, meaning it shares the same BA15s bayonet base but draws less power than a standard 1156.
The two bulb types are not interchangeable, as the 194 uses a wedge base and the 67 uses a bayonet base, making them physically incompatible with each other's sockets.
The wattage difference between the two types is notable, with the 67 at 8 watts drawing more than twice the power of the 194 at 3.78 watts.