The Iveco EuroTurbo 340T uses a 1156 bulb size for both front and rear turn signal applications. The replacement chart covers vehicle production spanning 1987 to 1990.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 is the sole bulb type specified across all turn signal positions on the Iveco EuroTurbo 340T for the 1987-1990 model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function per socket rather than combining two functions such as braking and signaling into a shared unit.
It operates on a 12-volt electrical system and draws 21 watts, which places it in the standard incandescent range for automotive turn signal applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant with which it is not interchangeable.
The 1156 designation follows the ANSI standard used in the United States and Canada, indicating a standardized specification for base type, voltage, and wattage rather than a proprietary format.
Both the front and rear turn signal positions share the same 1156 specification across the full 1987-1990 range, meaning a single bulb type serves all four turn signal sockets on the vehicle.
Because the BA15s base accepts only single-contact bulbs, substituting a dual-contact bayonet bulb such as the 1157 would result in an incompatible fit despite the physical similarity of the base housing.