Ford Windstar front turn signal bulbs use 3157NA or 3457NA sizes, while rear turn signal bulbs use 2456 or 3156 sizes. The replacement chart covers 1995 to 2003 model 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 Windstar front turn signal position uses the 3157NA bulb for model years 1996-2003, making it the most consistently specified bulb across this part of the fitment data.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W power split, where the higher wattage filament serves the turn signal function and the lower wattage filament serves a secondary lighting function such as parking or running light duty.
The natural amber glass designation in the 3157NA and 3457NA bulbs produces an amber output directly from the glass envelope rather than relying on an amber lens, which is the meaning of the "NA" suffix in the ANSI naming convention.
The 1995 Ford Windstar front turn signal takes the 3457NA rather than the 3157NA, which shares the same T25 wedge base, dual-filament design, natural amber glass, and 12V 27W/7W ratings as the 3157NA, yet the two are listed as distinct part numbers and are not confirmed interchangeable by these specifications.
The rear turn signal position alternates between the 2456 and the 3156 across different model years, with the 2456 specified for 1995, 1996, 1998, 2000, 2002, and 2003, while the 3156 is specified for 1997, 1999, and 2001.
The 3156 is a single-filament T25 wedge bulb rated at 12V and 27W, meaning it serves only one lighting function per socket, unlike the dual-filament 3157NA used at the front.
The 2456 is classified as a festoon bulb intended for specialty applications, operating at 12V, and its physical form factor differs from the T25 wedge style used in the front turn signal and in the 3156 rear application.
Because the rear turn signal socket accepts either a festoon-style 2456 or a T25 wedge-style 3156 depending on the model year, the two bulb types are not physically interchangeable despite both serving the same rear turn signal function on the Ford Windstar.
All four bulb types listed across both turn signal positions conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and photometric performance requirements for each part number.
Selecting a replacement bulb for the rear turn signal of the Ford Windstar requires confirming the specific model year, as the socket type differs between years that use the festoon 2456 and those that use the wedge-base 3156.