GMC Brigadier License Plate Bulb Size

The GMC Brigadier license plate light requires a unique 67 bulb size for proper installation and function. Data for the specific lighting component covers the range from 1984 to 1988.

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
1984-1988	67 (Tiltmaster)

Bulb Specifications

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

Other Locations

Additional Notes

The bulb 67 is the sole license plate bulb size listed across all model years in the GMC Brigadier specifications, covering the Tiltmaster variant from 1984-1988.
The 67 bulb follows the ANSI standard recognized in both the United States and Canada, classifying it as a standardized automotive bulb within North American markets.
It operates on a 12-volt electrical system at 8 watts, placing it in the lower power range typical of auxiliary lighting applications such as license plate illumination.
The 67 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount with a 15mm collar width, designed for a twist-and-lock installation without a secondary contact pin.
The 67 is a single-filament bulb, meaning it serves one lighting function only, with no secondary filament for an alternate intensity mode.
The 67 is described as a lower wattage variant of the 1156 bulb. While both share the BA15s bayonet base, the 1156 operates at a higher wattage, making the two non-interchangeable in applications where wattage ratings are a factor.