Ford E-350 License Plate Bulb Size

The Ford E-350 license plate bulb uses either 194 or 168 size bulbs depending on the specific model year. The replacement chart covers vehicle production from 1975 to 1998 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.

Bulb Size by Year Range

Years	Bulb Size
1995-1998	194
1994	168
1975-1993	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Ford E-350 license plate bulb is the 194 across the 1975-1993 and 1995-1998 model years, making it the dominant fitment across this vehicle's specification range.
The 194 is an ANSI-standardized miniature wedge bulb of the T10 form factor, rated at 12 volts and 3.78 watts.
The 168 is also an ANSI-standardized T10 miniature wedge bulb rated at 12 volts, though it draws 4.9 watts, making it a higher-wattage unit than the 194 despite sharing the same physical form factor.
Because the 194 and 168 share the T10 wedge base, they are physically interchangeable in the socket, but their wattage ratings differ and each year's specification calls for a distinct type.
The 1994 Ford E-350 is the sole model year in these specifications to use the 168 bulb for the license plate position, setting it apart from all surrounding years.
Both bulb types carry ANSI standardization recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical tolerances rather than being proprietary fitments.
The T10 designation refers to the bulb's tubular envelope width, expressed in eighths of an inch, placing the envelope at 10/8 of an inch, or approximately 1.25 inches wide.
The wattage difference between the 194 and the 168 reflects a difference in filament resistance, with the 168's filament producing slightly more light output at the cost of greater current draw on the vehicle's electrical circuit.