International S1624 Back Up Light Bulb Size

The International S1624 back up light requires a bulb size of 1156 for the lighting assembly. Data for the bulb 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	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 S1624, covering model years 1980-1982.
The 1156 operates on 12 volts with a 21-watt single filament, classifying it as a standard incandescent bulb suited for reverse lighting applications.
The BA15s bayonet base on the 1156 features a single contact pin offset to one side, which physically prevents incorrect installation of double-contact variants such as the 1157.
The 1156 carries ANSI standardization recognized in both the United States and Canada, meaning the bulb conforms to a defined set of electrical and physical tolerances across manufacturers.
Because the 1156 is a single-filament bulb, it serves only one lighting function per socket, distinguishing it from dual-filament types that combine two functions such as stop and tail in a single unit.