GMC V3500 License Plate Bulb Size

The GMC V3500 license plate light uses 194 and 67 bulb sizes according to the provided data. Information for the specified vehicle covers the range from 1987 to 1991.

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
1988-1991	194
1987	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 V3500 uses two distinct bulb types across its license plate fitment history: the 194 and the 67, both conforming to ANSI standards recognized in the US and Canada.
The 194 bulb is a T10 miniature wedge type rated at 12V and 3.78W. Its wedge base means it is held in place by the socket itself rather than by a separate locking mechanism.
The GMC V3500 (1988-1991) uses the 194 bulb for the license plate position.
The 67 bulb carries a BA15s bayonet base, a single-contact fitting that requires an align-and-twist installation rather than a straight push-in wedge connection, making it physically incompatible with sockets designed for the 194.
The 1987 GMC V3500 uses the 67 bulb for the license plate position.
The 67 is rated at 12V and 8W, more than double the wattage of the 194 at 3.78W. This difference means the two bulbs are not interchangeable without risking a mismatch in socket type and power draw.
The base type change between the 67 and the 194 represents a hard fitment incompatibility. A 194 wedge bulb cannot be seated into a BA15s bayonet socket, and vice versa.
The 67 is described as a lower wattage variant of the 1156 bulb. While it shares the BA15s bayonet base with the 1156, the wattage difference means the 1156 is not a direct substitute for the 67 in this application.