Ford Pinto front and rear turn signal bulbs utilize 1157, 1157NA, and 1034NA bulb sizes depending on location and model variation. The replacement chart covers 1971 through 1980 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157, 1157NA, and 1034NA bulb types appear across all front and rear turn signal positions on the Ford Pinto from 1971 through 1980.
All three bulb types share the same BAY15d bayonet base and operate at 12V with a dual-filament configuration rated at 21W for the high-intensity filament and 5W for the low-intensity filament.
The dual-filament design allows a single bulb to serve both the turn signal and a secondary function, such as a running or parking light, within the same housing.
The 1157NA and 1034NA variants feature natural amber glass, which produces an amber signal output without relying on a colored lens to filter a clear bulb.
The 1034NA is classified as a variant of the 1157 and shares the BAY15d base and 12V/21W/5W ratings, though it is a distinct ANSI part number and is not a direct drop-in substitute for the 1157 or 1157NA without confirming socket and housing compatibility.
The Ford Pinto rear turn signal position used the 1157 bulb consistently across all model years from 1971-1980, with no amber glass variants specified for that position.
The front turn signal position used the 1034NA for the 1971, 1974, and 1975 model years, while the 1157NA was specified for 1972-1973 and 1978-1979, and the standard 1157 was specified for 1976-1977 and 1980.
Because the front turn signal alternated between the 1157, 1157NA, and 1034NA across different model years, substituting one type for another requires confirming that the replacement bulb matches the socket type and lens color of the specific model year.
All three bulb types conform to ANSI standards recognized in both the United States and Canada, indicating they meet a common electrical and physical specification within those markets.
The BAY15d base is a double-contact bayonet fitting with offset pins, a design that prevents incorrect single-contact bulbs from being seated in a dual-filament socket.