The International Scout II front and rear turn signal bulbs both utilize a 198 size bulb for proper operation. The replacement chart covers vehicle production spanning 1971 to 1980.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International Scout II uses the 198 bulb for both the front and rear turn signals across all model years covered in the specifications, spanning 1971-1980.
The 198 is classified as a miniature wedge bulb, meaning it has no metal base or pins and instead relies on the wedge shape of its glass envelope to make contact within the socket.
The T5 designation refers to the bulb's tubular shape with a width of 5/8 of an inch, placing it among the smaller bulb forms used in automotive applications.
The 198 operates at 12 volts and draws 2 watts, which reflects a very low power output consistent with indicator and signal lighting rather than illumination lighting.
The 198 conforms to ANSI standards, indicating it meets the specifications set by the American National Standards Institute and is recognized for use in both the United States and Canada.
Because the same bulb number applies to both the front and rear turn signal positions on the International Scout II, a single bulb type serves both locations without substitution.
The wedge base format of the 198 is not interchangeable with bayonet-base or screw-base bulb types, even when electrical ratings are otherwise similar.