International S1824 License Plate Bulb Size

The International S1824 license plate light requires a bulb size of 1157 for proper illumination. Data for the specified lighting component covers the range from 1980 through 1985.

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
1980-1985	1157

Bulb Specifications

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

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Additional Notes

The International S1824 uses the 1157 bulb for the license plate position across the 1980-1985 model years.
The 1157 is an ANSI-standardized bulb type recognized across the United States and Canada, establishing a consistent specification baseline for this application.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, each operating at a different wattage.
The two filaments in the 1157 operate at 21W and 5W respectively, with the lower-wattage filament typically serving a continuous low-intensity function and the higher-wattage filament serving a higher-intensity function.
The 1157 operates on a 12V electrical system, which is standard for automotive applications of this era.
The 1157 uses a BAY15d bayonet base, a two-pin base type where the two pins are offset at different heights to ensure correct orientation during installation.
The BAY15d base is a keyed fitment, meaning a bulb with a standard BAY15d base with pins at equal heights is not a direct substitute, as the offset pin configuration is specific to dual-filament applications.