Ford E-450 Super Duty License Plate Bulb Size

The Ford E-450 Super Duty license plate light uses 194 and 168 bulb sizes depending on the specific production version. Available information covers the time range from 2003 through 2019.

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
2015-2019	194
2004-2014	168
2002-2003	194
2001	168
2000	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-450 Super Duty license plate position uses two distinct bulb sizes across its model years: the 194 and the 168, both of which are ANSI-standardized miniature wedge bulbs classified under the T10 form factor.
Both the 194 and 168 bulbs share the same T10 wedge base and operate on a 12-volt system, which means they are physically interchangeable in terms of socket fit.
Despite the shared base and voltage rating, the 194 and 168 differ in wattage. The 194 draws 3.78W while the 168 draws 4.9W, making them electrically distinct and not true equivalents for direct substitution.
The 194 bulb is specified for the Ford E-450 Super Duty in 2015-2019, representing the most recent five-year span covered in the specifications.
The 168 bulb is specified across the 2004-2014 model years, the longest continuous run of a single bulb type in these specifications, totaling eleven consecutive years.
The years 2000, 2002, and 2003 each call for the 194 bulb, while 2001 calls for the 168, indicating that the two bulb types alternated within that early period rather than following a single consistent pattern.
Both bulb types conform to ANSI standards recognized in the United States and Canada, meaning their electrical and physical characteristics are governed by a shared North American standardization framework.
The T10 designation refers to the bulb's tubular envelope width, expressed in eighths of an inch, placing the envelope at 10/8 or 1.25 inches wide, a format common to low-wattage indicator and auxiliary lighting applications.
Because the 194 and 168 share the same wedge base, a 168 bulb will seat physically in a socket designed for a 194, and vice versa, though the wattage difference means current draw will not match the original specification.
The license plate bulb position on the Ford E-450 Super Duty consistently uses a single bulb size per model year with no dual-bulb or alternative fitment noted across any of the listed years.