International S1853FC Back Up Light Bulb Size

The International S1853FC back up light requires a bulb size of 1156 for the specific lighting component located at the rear of the vehicle. Data for the bulb size covers the range from 1987 to 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
1987-1989	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 1156 is the sole bulb type listed for the back up light on the International S1853FC, covering the 1987-1989 model years.
The 1156 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared by compliant manufacturers.
As a single-filament bulb, the 1156 serves one lighting function per unit, which aligns with its dedicated role as a back up light source rather than a combined stop/tail application.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single locating pin. This base type requires a socket specifically designed for single-pin bayonet fitment and is not interchangeable with double-contact BA15d sockets.
The 1156 operates at 12 volts and draws 21 watts, placing it within the standard low-voltage DC range used in automotive electrical systems of that era.