International S1824 Back Up Light Bulb Size

The International S1824 back up light requires a 1156 bulb size for proper installation and function. Data for the specified component covers the period from 1980 through 1985.

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
1980-1985	1156

Bulb Specifications

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

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Additional Notes

The International S1824 uses the 1156 bulb for its back up light across the 1980-1985 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared across the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical of incandescent automotive bulbs used in signaling and reversing light applications.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its role as a dedicated back up light bulb.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a bayonet fitting with a 15mm collar and a single contact pin, distinguishing it from double-contact bayonet variants.
The BA15s single-contact base of the 1156 is not interchangeable with the BA15d double-contact base used on bulbs such as the 1157, despite the similar physical housing size.