The International 9600 front turn signal uses a 1156 bulb size while the rear turn signal requires a 1157 bulb size. A replacement chart covering 1989 to 1996 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 9600 uses the 1156 bulb for the front turn signal across all listed model years, spanning 1989-1996.
The 1156 is a single-filament bulb operating at 12V and 21W, fitted with a BA15s bayonet base, and recognized under ANSI standards in both the United States and Canada.
A single-filament design means the 1156 serves one dedicated function, which aligns with its role as a turn signal source rather than a combined stop and tail light.
The rear turn signal on the International 9600 uses the 1157 bulb for all listed model years, also spanning 1989-1996.
The 1157 is a dual-filament bulb rated at 12V with two wattage outputs, 21W for the high-intensity filament and 5W for the low-intensity filament, and it uses a BAY15d bayonet base.
The dual-filament configuration of the 1157 allows a single bulb to serve two separate lighting functions, typically combining turn signal and tail or parking light duties in the same housing.
The BA15s base of the 1156 and the BAY15d base of the 1157 are not interchangeable. The BAY15d base has offset locating pins to prevent incorrect installation of a single-filament bulb in a dual-filament socket.
Although both the 1156 and 1157 share a 15mm bayonet base width and a 12V operating voltage, substituting one for the other would result in either a non-functional circuit or incorrect lighting behavior due to filament and base differences.