Ferrari Mondial t front turn signal bulbs use 1156 or 1073 size, while rear turn signal bulbs use 1156 size. The replacement chart covers 1989 to 1993 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ferrari Mondial t uses two distinct bulb types across its front turn signal positions: the 1156 for model years 1990-1993 and the 1073 for the 1989 model year.
The rear turn signal position uses the 1156 bulb uniformly across all model years covered in the specifications, from 1989-1993.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is recognized under US and Canadian standards.
The 1073 is also an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V but drawing only 13W, making it a lower-wattage variant relative to the 1156.
Although both the 1156 and 1073 share the same BA15s bayonet base type, they are not interchangeable without consequence, as the wattage difference of 8W means the 1073 produces less light output than the 1156.
The shared BA15s base between the 1073 and 1156 means one bulb can physically seat into the other's socket, which raises the risk of an incorrect substitution going unnoticed during installation on the 1989 Ferrari Mondial t front turn signal position.
A turn signal circuit calibrated for a 21W bulb, such as those used with the 1156, may flash at an irregular rate if a 13W bulb like the 1073 is substituted, since many flasher relays detect load to regulate flash frequency.
The 1989 model year is the only year in the specifications where the front and rear turn signal positions require different bulb types, with the front using the 1073 and the rear using the 1156.