The International 4700LP front turn signal bulb measures 1156 in size, while the rear turn signal bulb measures 1157 in size. The replacement chart covers vehicle production spanning 1992 to 1997 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 4700LP uses two distinct bulb types across its front and rear turn signal positions for the 1992-1997 model years: the 1156 at the front and the 1157 at the rear.
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 1157 is a dual-filament bulb operating at 12V with filaments rated at 21W and 5W respectively, fitted with a BAY15d bayonet base, and likewise recognized under ANSI standards in both the United States and Canada.
The BA15s base of the 1156 and the BAY15d base of the 1157 are not interchangeable. The BAY15d base features offset locating pins to prevent incorrect installation, while the BA15s base has symmetrical pins, making the two physically incompatible.
Although both the 1156 and 1157 share the same 12V operating voltage and a 21W primary filament rating, the single-filament design of the 1156 means it cannot replicate the dual-function behavior of the 1157, which serves both turn signal and running light roles through its secondary 5W filament.