The Maserati Biturbo front and rear turn signal bulbs both utilize a 1156 size bulb for proper illumination. Replacement chart data covers 1983 to 1987 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 Maserati Biturbo uses the 1156 bulb for both its front and rear turn signals across the 1983-1987 model years.
The 1156 is a single-filament bulb, meaning it is dedicated to one lighting function rather than serving dual purposes such as combined stop and turn signal operation.
The 1156 operates at 12 volts and 21 watts, which is consistent with standard automotive electrical systems of that era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The 1156 conforms to ANSI standards and is specified for use in the United States and Canada.
The uniform use of the 1156 across both front and rear positions means a single bulb type serves all four turn signal positions on the Maserati Biturbo.
The BA15s base designation indicates a single contact point at the base, which distinguishes it from the BA15d double-contact variant used in dual-filament applications and confirms the two are not interchangeable.