Ford F-350 Super Duty License Plate Bulb Size

Additional Notes

• The Ford F-350 Super Duty license plate position uses two bulb sizes across its model years: the 168 and the 194. Both are ANSI-standardized miniature wedge bulbs of the T10 type, operating on a 12-volt circuit.
• The 168 bulb draws 4.9 watts, while the 194 draws 3.78 watts. Although both share the same T10 wedge base, the wattage difference means the two types are not electrically interchangeable without consequence to circuit load.
• The Ford F-350 Super Duty uses the 168 bulb from 1999 through 2010, covering a continuous span of twelve model years in the license plate position.
• Model years 2011-2016 require the 194 bulb for the license plate position, representing a departure from the 168 specification used in earlier years.
• From 2017-2020, the 168 bulb applies specifically to vehicles equipped with Halogen Capsule Headlamps. This conditional fitment note indicates that headlamp type is a determining factor in the correct license plate bulb selection for those model years.
• The 2021-2023 model years return to the 168 bulb without any listed headlamp-type condition, making the fitment unconditional for those years.
• The T10 wedge base is a push-in, solderless format with no locking tabs, which is standard across both the 168 and 194 types. The physical base compatibility between the two can create a risk of incorrect substitution if wattage ratings are not observed.
• Both the 168 and 194 are governed by ANSI standards applicable in the United States and Canada, meaning their electrical and photometric characteristics conform to a defined North American specification.