Jeep CJ5A License Plate Bulb Size

The Jeep CJ5A license plate light requires a bulb size of 89 for the rear exterior illumination system. Data for the specified vehicle covers the period from 1966 through 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 is an ANSI-standardized single-filament bulb rated at 12 volts and 13 watts, fitted with a BA15s bayonet base.
The BA15s base designation indicates a single-contact bayonet mount with a 15mm base width, which is distinct from dual-contact bayonet variants and is not interchangeable with them.
The 89 bulb is a lower wattage variant of the 1156, meaning the two share the same BA15s base type but differ in wattage output, making them non-interchangeable in applications where wattage tolerance is a factor.
The Jeep CJ5A uses the 89 bulb for its license plate position across the 1966-1968 model years.