International 4800 Back Up Light Bulb Size

The International 4800 back up light utilizes bulb size 1156 for illumination purposes. Data for the specific component covers the range from 1992 through 1997.

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
1992-1997	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 specified for the backup light across all listed model years of the International 4800.
The 1156 operates on 12 volts and draws 21 watts, placing it in the mid-range of standard automotive incandescent output for single-circuit applications.
The 1156 uses a BA15s bayonet base, which is a single-contact base with a 15mm collar. The "s" designation indicates a single contact point at the base, distinguishing it from dual-contact variants.
Being a single-filament bulb, the 1156 serves functions that require only one lighting mode, making it well suited for dedicated backup light duty rather than combined stop/tail applications.
The 1156 conforms to ANSI standards recognized in both the United States and Canada, reflecting a standardized specification common across North American vehicle applications.
The International 4800 backup light uses the 1156 bulb consistently across the 1992-1997 model years, indicating no change in the lighting specification during that period.
The BA15s bayonet base requires a quarter-turn locking motion for installation and is not interchangeable with the BA15d base, which carries two offset contact pins rather than one. Using a dual-contact bulb in a single-contact socket would result in improper fitment.
The 1156 is also commonly referenced by the trade designation 7506 in international markets, though the specifications here cite the ANSI 1156 designation applicable to North American fitment.