International S1823 License Plate Bulb Size

The International S1823 license plate light requires a 1157 bulb size for proper installation and function within the rear exterior lighting assembly. Data for 1157 bulb specifications covers the range from 1980 through 1982.

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
1980-1982	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The 1157 is the sole bulb type listed for the International S1823 license plate position across the 1980-1982 model years.
The 1157 is an ANSI-standard bulb recognized in both the United States and Canada, making it a widely distributed and commonly stocked part in North American markets.
As a dual-filament bulb, the 1157 carries two separate wattage ratings: 21W for the higher-intensity filament and 5W for the lower-intensity filament, housed within a single glass envelope.
The 1157 uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to prevent incorrect insertion orientation.
The 1157 operates on a 12V electrical system, consistent with the standard automotive voltage found in light-duty and medium-duty vehicles of that era.
The BAY15d base is not interchangeable with single-filament bayonet bases such as the BA15s, as the pin offset and dual-filament wiring are specific to the BAY15d socket design.