The International 4700 uses a 1156 bulb size for front turn signal applications and a 1157 bulb size for rear turn signal functions. The replacement chart covers vehicle production spanning 1992 to 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 4700 uses the 1156 bulb for the front turn signal across all listed model years, spanning 1992-1997.
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.
The BA15s base designation indicates a single-contact bayonet mount, which is not interchangeable with dual-contact bayonet bases.
The rear turn signal on the International 4700 uses the 1157 bulb across the same 1992-1997 model year range.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, fitted with a BAY15d bayonet base, and also recognized under ANSI standards in the United States and Canada.
The BAY15d base on the 1157 features two offset pins that prevent insertion of a single-contact BA15s bulb, making the front and rear turn signal bulbs physically non-interchangeable despite sharing the same voltage rating.
The dual-filament design of the 1157 allows it to serve both a turn signal function and a secondary lighting function, such as a running or brake light, within a single housing.
Both the 1156 and 1157 share the same 21W output on their primary filaments, though their base types and filament configurations differ in ways that prevent cross-installation.