The Ferrari 348 TS front and rear turn signal bulbs both utilize a 1156 bulb size for replacement applications. The chart contains specifications covering 1989 through 1992 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ferrari 348 TS uses the 1156 bulb for both its front and rear turn signals across the 1989-1992 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard used in the United States and Canada.
The 1156 is a single-filament bulb, which means it serves only one lighting function per socket, as opposed to dual-filament types that can handle two functions such as braking and turn signaling simultaneously.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place rather than screwed in.
The 1156 operates at 12 volts and 21 watts, consistent with standard automotive electrical systems.
Because the front and rear turn signal positions on the Ferrari 348 TS share the same 1156 specification, a single bulb type serves all four turn signal sockets on the vehicle.
The BA15s base designation indicates a single contact point at the base, which is a key fitment detail distinguishing it from the visually similar BA15d base used on dual-filament bulbs. Substituting a BA15d bulb in a BA15s socket would result in incorrect fitment.