Ford Transit Parking Light Bulb Size

Additional Notes

• The Ford Transit uses the 3457NA bulb for its parking light across the 2015-2023 model years, with a gap in the 2021-2022 data.
• The 3457NA is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared between the United States and Canada.
• This bulb follows the T25 wedge form factor, which refers to a wedge-base construction roughly 25mm in width, allowing it to seat directly into a socket without a separate metal base.
• The 3457NA carries a dual-filament design, operating at 27 watts on its primary filament and 7 watts on its secondary filament, which allows a single bulb to serve both a brighter and a dimmer lighting function within one housing.
• The bulb operates on a 12-volt electrical system, consistent with standard automotive low-voltage architecture.
• The natural amber glass of the 3457NA produces a yellow-orange light output without the use of a separate colored lens, as the tint is built directly into the glass envelope.
• The "NA" suffix in the 3457NA designation specifically denotes the natural amber glass coating, distinguishing it from the clear-glass 3457 variant, which produces white light output.
• Substituting a clear 3457 bulb in place of the 3457NA would alter the color output of the parking light, which may affect compliance with regulations requiring amber-colored front parking or turn signal illumination.