The Ford Five Hundred side marker requires a 194NA bulb size for proper installation and function. Data for 194NA bulbs covers the period from 2005 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Five Hundred uses two distinct bulb types across its side marker positions for the 2005-2007 model years: the 194NA for the front and the 916 for the rear.
The 194NA is a T10 miniature wedge bulb rated at 12V and 3.78W, making it a low-wattage lamp suited to the relatively low-intensity output required of front side markers.
The "NA" suffix in the 194NA designation indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-tinted lens or housing.
The 916 is a T15 wedge bulb rated at 12V and 18W, drawing significantly more power than the 194NA, which reflects the greater light output typically associated with rear side marker positions on this vehicle.
Both the 194NA and the 916 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications within those markets.
The T10 and T15 designations refer to the tubular bulb envelope size, with T10 indicating a smaller envelope than T15. These two bulb types are not interchangeable with each other due to differences in physical size and wattage.
A standard 194 wedge bulb shares the same T10 form factor as the 194NA but lacks the natural amber glass coating, making it a physically compatible though functionally different substitute where an amber output is required.
The consistent use of the same bulb sizes across all three model years means a single bulb specification applies to the entire 2005-2007 Ford Five Hundred production run for each marker position.