International S1854 Back Up Light Bulb Size

The International S1854 back up light requires a single 1156 bulb size for the rear lighting assembly. Data for the specified vehicle covers the range from 1981 through 1989.

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
1981-1989	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The International S1854 uses the 1156 bulb for the back up light across all listed model years, spanning 1981-1989.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which in this application is the back up light.
The 1156 operates at 12 volts and 21 watts, consistent with standard automotive electrical systems.
The 1156 uses a BA15s bayonet base, a single-contact bayonet mount that differs from the dual-contact BA15d base found on some other automotive bulbs. Substituting a dual-contact variant would result in an improper fit.
The 1156 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification shared across North American automotive applications.