Volvo 145 front and rear turn signal bulbs both utilize a 1156 size bulb for proper operation. The replacement chart covers vehicle production spanning 1968 to 1974.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 is the sole bulb type specified for the Volvo 145's turn signal system, covering both front and rear positions across the 1968-1974 model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function per socket rather than sharing a filament with a secondary function such as braking or running light duty.
The 1156 operates at 12 volts and draws 21 watts, which places it within the standard range for automotive turn signal applications of its era.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, as opposed to the dual-pin BA15d variant used in some other automotive applications.
The 1156 carries ANSI standardization for the United States and Canada, indicating the bulb conforms to a defined set of electrical and physical parameters recognized across those markets.
Because the Volvo 145 uses the same 1156 bulb in all four turn signal positions, front and rear sockets accept the same replacement unit without substitution between positions.
The BA15s base is not interchangeable with the BAY15d base found on dual-filament bulbs such as the 1157, despite a superficially similar bayonet-style fitting. Installing a dual-contact bulb in a single-contact socket is not mechanically compatible.