The Ford F-750 front turn signal uses 3157NA or 1157 bulb sizes, while the rear turn signal requires 3157 or 2057 bulb sizes. The replacement chart covers 2000 through 2022 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 Ford F-750 front turn signal uses the 3157NA bulb for model years 2017-2019 and 2021-2022, while the 1157 bulb fits the 2000-2003 model years.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament. Its natural amber glass produces the amber color required for turn signal use without relying on a colored lens.
The standard 3157, used in the F-750 rear turn signal for 2017-2019 and 2021-2022, shares the same T25 wedge base and 27W/7W power ratings as the 3157NA but has clear glass. The amber color in that application is produced by the lens rather than the bulb itself.
Although the 3157 and 3157NA share identical electrical ratings and the same T25 wedge base, they are not interchangeable in all positions. Substituting a clear 3157 in a position designed for the 3157NA may result in incorrect signal color output if the housing lacks an amber lens.
The 1157 bulb, fitted to the Ford F-750 front turn signal for 2000-2003, uses a BAY15d bayonet base and operates at 12V with a 21W high filament and 5W low filament.
The rear turn signal on the 2000-2003 Ford F-750 uses the 2057 bulb, which also carries a BAY15d bayonet base and is described as a brighter variant of the 1157, rated at 12V with a 26.9W high filament and 8W low filament.
Because the 1157 and 2057 share the BAY15d bayonet base, physical installation is possible in either socket. However, the 2057 draws more power on both filaments, and substituting one for the other may affect brightness levels relative to the original design specification.
All four bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, indicating a standardized electrical and mechanical specification shared across North American markets.
Every bulb specified for the Ford F-750 turn signals is dual-filament, meaning each bulb serves two functions within the same housing, typically combining the turn signal function with a secondary parking or running light function on the lower-wattage filament.
The shift from BAY15d bayonet-base bulbs in the 2000-2003 model years to T25 wedge-base bulbs in the 2017-2022 model years reflects a change in socket type between those generations of the Ford F-750, making bulbs from the two eras mechanically incompatible with each other's housings.