The International 7100 uses a 1156 bulb size for front turn signal applications and a 1157 bulb size for rear turn signal functions. A replacement chart covering 1992 through 1995 model years documents the bulb specifications for this vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 7100 uses the 1156 bulb for the front turn signal across the 1992-1995 model years.
The 1156 is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base, and recognized under ANSI standards in the US and Canada.
The rear turn signal on the 1992-1995 International 7100 takes the 1157 bulb.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base, also recognized under ANSI standards in the US and Canada.
The BA15s base of the 1156 and the BAY15d base of the 1157 are physically distinct and not interchangeable, as the BAY15d features offset locating pins to prevent incorrect installation of a single-filament bulb in a dual-filament socket.
The dual-filament design of the 1157 allows it to serve two lighting functions from a single socket, which is why it is suited for rear positions where both turn signal and running light functions are typically combined.
Both the 1156 and 1157 operate on a 12V electrical system, consistent with standard automotive voltage.