Ford Escape Turn Signal Bulb Size

Additional Notes

• The 7440NA is the most frequently specified bulb across the Ford Escape turn signal positions. It is a single-filament T20 wedge bulb rated at 12V and 21W, with natural amber glass that produces the amber signal color without relying on a tinted lens or housing.
• The "NA" suffix found on bulbs such as the 7440NA, 7444NA, 3457NA, 3357NA, and 3157NA designates natural amber glass. This coloring is built into the bulb envelope itself, which satisfies amber output requirements independently of the surrounding lamp assembly.
• The 7444NA differs from the 7440NA in that it carries a dual filament rated at 21W/5W, meaning it serves both a high-intensity turn signal function and a lower-intensity parking or position light function within a single bulb. Both share the T20 wedge base, but the filament count makes them non-interchangeable in most applications.
• For the Ford Escape (2019-2020), the front turn signal uses the dual-filament 7444NA rather than the single-filament 7440NA used at the rear, indicating the front lamp assembly on those model years combines turn signal and parking light duties in one socket.
• The 2018-2019 Ford Escape front turn signal fitment splits by headlamp type. Vehicles equipped with projector headlamps take the 7444NA, while those without projector headlamps take the 7443. The 7443 shares the T20 wedge base and 21W/5W rating with the 7444NA but lacks the natural amber glass coating.
• The T25 wedge family, which includes the 3157NA, 3357NA, and 3457NA, was used in earlier Escape front turn signal positions. The T25 base is physically larger than the T20 base, making bulbs from these two families incompatible with each other's sockets regardless of wattage similarity.
• The 3357NA is a single-filament T25 bulb at 27W, while the 3457NA and 3157NA are dual-filament T25 bulbs at 27W/7W. Despite sharing the same base type and wattage ratings, single- and dual-filament versions serve different circuit configurations and are not interchangeable where the socket is wired for two filaments.
• The rear turn signal on the 2001-2005 and 2003-2004 Escape used the 2456, a festoon-style bulb rated at 12V. The festoon format is physically distinct from wedge and bayonet base types, as it is held in place by contact at each end of the cylindrical envelope rather than by a base inserted into a socket.
• The 2006 rear turn signal on the Ford Escape is the sole model year in the specifications to use the 2356, a dual-filament bulb with a BAY15d bayonet base. The BAY15d base uses an offset pin arrangement to ensure correct filament orientation, and it is not physically compatible with the festoon or wedge sockets used in adjacent model years.
• The 4157 rear turn signal bulb, used on the 2008-2012 Escape, is a dual-filament T25 wedge rated at 27W/7W. It does not carry the NA natural amber designation, meaning the amber signal color on those rear assemblies is produced by the lens rather than the bulb glass itself.