International S2375 Back Up Light Bulb Size

The International S2375 back up light requires bulb size 1156 for proper installation and function within the lighting assembly. Data for the specified component covers the range from 1984 to 1988.

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
1988	1156
1986	1156
1984	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 1156 is the sole bulb type listed for the International S2375 back up light across all specified model years.
The 1156 follows the ANSI standard, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
It is a single-filament bulb, which is typical for back up lights since the function requires only one consistent light output state rather than dual-intensity operation.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The bulb operates at 12 volts and 21 watts, consistent with standard 12V automotive electrical systems.
The International S2375 (1984, 1986, and 1988) shares the same 1156 bulb size across all three listed model years, indicating consistent back up light socket design over that period.
The BA15s designation denotes a single-contact bayonet base with a 15mm cap, which is not interchangeable with the BA15d double-contact variant despite the similar base size.