Ford F-150 Parking Light Bulb Size

Additional Notes

• The 3157NA bulb is the most frequently specified front parking light bulb across Ford F-150 model years, covering 1998-2014, and is a dual-filament T25 wedge type rated at 12V with a 27W high filament and 7W low filament, with natural amber glass.
• The "NA" suffix present on several bulb designations, including 194NA, 3157NA, 7443NA, 7444NA, 1157NA, and 1034NA, denotes natural amber glass, meaning the amber color is produced by the glass itself rather than by a coating or lens tint.
• The 1157 and 1157NA bulbs, specified for the Ford F-150 from 1977-1986 and 1981 respectively, use a BAY15d bayonet base, which is a physically distinct mounting type from the wedge base used in later bulb designations and is not interchangeable with wedge-base sockets.
• The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V, 21W/5W, and are specified for the F-150 from 2015-2016 and 2017-2019 respectively, with fitment restricted to vehicles equipped with halogen capsule headlamps.
• The 3157 and 3157NA share identical voltage and wattage ratings at 12V, 27W/7W in a T25 wedge form, with the only difference being the presence of natural amber glass on the NA variant, a distinction relevant to jurisdictions or applications requiring amber-colored parking lights.
• The 194NA, specified for the Ford F-150 from 2021-2023, is a single-filament miniature T10 wedge bulb rated at just 3.78W, representing a substantially lower wattage than the dual-filament bulbs used in earlier model years.
• The 1034NA, specified for 1975-1976, is described as a variant of the 1157 and shares the BAY15d bayonet base along with the same 12V, 21W/5W ratings, though the two are listed as distinct ANSI designations and may not be directly interchangeable in all socket configurations.
• The 4257NA, specified for the 2020 F-150, is a dual-filament wedge bulb with natural amber glass rated at 12V, and its T-series envelope size is not shared with the T20 or T25 wedge bulbs used in adjacent model years, indicating a socket change for that year.
• The 916 bulb, specified for 1992 and 1994-1996, is a single-filament T15 wedge type rated at 12V and 18W, and unlike the 3157 or 1157 series, it carries no dual-filament designation, meaning it serves only a single lighting function per socket.
• Wedge-base bulbs and BAY15d bayonet-base bulbs are mechanically incompatible, and the F-150 specifications reflect a transition between these base types across different generations, with bayonet-base bulbs appearing in 1975-1986 model years and wedge-base types in later years.