The Mitsubishi Fuso FM front and rear turn signal bulbs both utilize a 1156 size. The replacement chart covers vehicle production spanning 1986 to 1995.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mitsubishi Fuso FM uses the 1156 bulb for both its front and rear turn signals across the 1986-1995 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard used in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent turn signal applications in commercial vehicles of this era.
The bulb uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
Because the 1156 is a single-filament bulb, it serves one lighting function per socket, which is consistent with its dedicated turn signal role rather than a combined stop and turn application.
The BA15s base is not interchangeable with the BA15d base despite sharing the same 15mm collar width, as the pin configurations differ and a dual-contact bulb cannot seat correctly in a single-contact socket.
The identical 1156 specification across both the front and rear positions means a single bulb type covers all four turn signal sockets on the vehicle.