The Iveco EuroTurbo 335T uses 1156 bulb size for both front and rear turn signal applications. The replacement chart covers 1987 to 1990 vehicle production years 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 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12 volts and 21 watts under the ANSI standard used in the United States and Canada.
The BA15s designation refers to a single-contact bayonet base with a 15mm collar, which is distinct from the BA15d double-contact variant. The two are not interchangeable despite sharing the same physical collar size.
The Iveco EuroTurbo 335T uses the 1156 bulb for both the front and rear turn signals across the 1987-1990 model years.
Because the same bulb type is specified for both front and rear positions, a single 1156 bulb serves all four turn signal positions on the vehicle.
The single-filament construction of the 1156 means it is dedicated to one function only, unlike dual-filament bulbs such as the 1157, which combine stop and turn signal functions in one unit.
At 21 watts, the 1156 produces a relatively high light output for a turn signal bulb, which is consistent with its use in commercial vehicle applications where signal visibility is a practical requirement.