Iveco Z340T Turn Signal Bulb Size

The Iveco Z340T uses 1156 bulb size for both front and rear turn signal applications. Replacement chart data covers 1980 to 1986 production years.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
1980-1986	1156

Years	Bulb Size
1980-1986	1156

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

The 1156 is the specified bulb type for both the front and rear turn signals of the Iveco Z340T across all listed model years from 1980 to 1986.
The 1156 is an ANSI-standardized bulb type, meaning it conforms to a defined set of electrical and physical characteristics recognized across the United States and Canada.
As a single-filament bulb, the 1156 is dedicated to one lighting function at a time, which suits its role in turn signal applications where a separate circuit handles each function independently.
The 1156 operates on a 12-volt electrical system and draws 21 watts, figures consistent with standard automotive turn signal circuits of that era.
The BA15s designation refers to a bayonet-style base with a 15mm collar and a single contact pin, which locks the bulb into its socket with a push-and-twist motion.
Because both the front and rear turn signal positions on the Iveco Z340T share the same 1156 specification, a single bulb type serves all four turn signal housings on the vehicle.
The BA15s base is not interchangeable with the BA15d base, which carries two offset pins rather than one; substituting a dual-pin bulb into a single-pin socket is not mechanically compatible.