Ford E-350 Super Duty License Plate Bulb Size

The Ford E-350 Super Duty license plate light uses 194 and 168 bulb sizes depending on the specific production period for the vehicle. Available information covers the range from 1999 through 2023 for the specified lighting components.

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
2023	194
2015-2019	194
2004-2014	168
2001-2003	194
1999-2000	168

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 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 circuit, which means they are physically interchangeable in terms of socket fitment.
Despite their physical similarity, 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 Ford E-350 Super Duty (2015-2019 and 2023) uses the 194 bulb for the license plate position.
Model years 2004-2014 use the 168 bulb, representing the longest continuous span of a single bulb type in these specifications.
The years 2001-2003 use the 194 bulb, while 1999-2000 use the 168, indicating that the bulb specification changed at least once within the early production years covered.
The T10 wedge base is a tool-free, push-in socket design, meaning the bulb is retained by the tension of the socket contacts rather than a locking mechanism.
Both bulbs carry ANSI standardization applicable to the US and Canadian markets, confirming consistent regional availability across the specification range.