Fiat Strada front turn signal bulbs measure 1157 in size, while rear turn signal bulbs measure 1156 or 1073, with each bulb size corresponding to specific applications on the vehicle. The replacement chart covers 1979 through 1982 model production years and details bulb size specifications for turn signal applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Fiat Strada front turn signal uses the 1157 bulb across all listed model years, 1979-1982.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The dual-filament design of the 1157 allows a single bulb to serve two lighting functions, which is why it is commonly found in positions that combine turn signal and parking light duties.
The rear turn signal on the Fiat Strada uses the 1156 for 1979-1980 and 1982, while the 1981 model year uses the 1073 instead.
The 1156 and 1073 are both single-filament bulbs sharing the same BA15s bayonet base, meaning the socket type is physically identical between the two.
Despite the shared base, the 1156 is rated at 21W while the 1073 is rated at 13W, making them non-equivalent in output and not directly interchangeable without accounting for the wattage difference.
The BAY15d base of the 1157 and the BA15s base of the 1156 and 1073 are distinct fittings, so front and rear turn signal bulbs on the Fiat Strada are not interchangeable with one another.
All three bulb types listed, the 1157, 1156, and 1073, are ANSI-standardized for the US and Canadian markets and operate on a 12V electrical system.