Jeep CJ6A License Plate Bulb Size

The Jeep CJ6A license plate light requires a bulb with the unique size 89 for proper illumination. Data for the specified lighting component covers the range from 1966 to 1968.

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
1966-1968	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The bulb type 89 appears across all documented model years of the Jeep CJ6A in this specification set, covering 1966-1968, making it the sole bulb type listed for the license plate position on this vehicle.
The 89 bulb follows the ANSI standard, meaning it conforms to a standardized specification recognized in both the United States and Canada.
It is a single-filament bulb, which is typical for license plate lighting, as that position requires only a steady illumination function with no switching between brightness levels.
The 89 bulb uses a BA15s bayonet base, a single-contact bayonet mount where the "s" denotes a single contact pin offset to one side, ensuring correct rotational orientation during installation.
The bulb operates at 12 volts and draws 13 watts, placing it within the low-wattage range standard for auxiliary lighting positions such as license plate lamps.
The 89 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, meaning the two are not directly interchangeable without accounting for the difference in power draw.