The Ford F-650 parking light requires a bulb size of 1157 for the specific lighting component located on the exterior of the vehicle. Available data for the bulb size covers the range from 2000 to 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford F-650 front parking light position uses two distinct bulb types across its model years: the 3157NA for 2017-2019 and 2021-2022, and the 1157 for 2000-2003.
The 3157NA is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and 7W low filament, and features natural amber glass that produces a yellow-tinted output without the need for an amber-colored lens.
The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and 5W low filament, and uses a BAY15d bayonet base, which is a two-pin offset bayonet mount designed to prevent incorrect installation orientation.
Both the 3157NA and 1157 conform to ANSI standards recognized in the United States and Canada, meaning their physical and electrical characteristics follow a defined industry specification rather than a proprietary design.
The 3157NA and 1157 are not interchangeable. The 3157NA uses a wedge-style base while the 1157 uses a BAY15d bayonet base, making the two physically incompatible with each other's sockets.
The natural amber designation in the 3157NA distinguishes it from the standard clear 3157. Substituting a clear 3157 in a position specified for the 3157NA may not meet amber color output requirements where those are regulated.
The dual-filament design of both bulb types indicates the front parking light socket on the F-650 carries two separate circuits, typically serving both a parking light function at lower wattage and a turn signal or daytime running function at higher wattage.
The higher wattage filament of the 3157NA at 27W exceeds that of the 1157 at 21W, reflecting a difference in light output between the two generations of fitment on the F-650.