Ford F-750 front and rear side marker bulbs utilize 12961 or 194 size bulbs at the front and 3157 or 194 size bulbs at the rear, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 2000 through 2022 model years with corresponding bulb size specifications for side marker applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford F-750 uses three distinct bulb types across its front and rear side marker positions: the 12961, the 194, and the 3157.
The 194 and 3157 are both ANSI-standardized bulb types recognized in the United States and Canada, while the 12961 is a Philips part number designation.
The Ford F-750 (2017-2019 and 2021-2022) takes a 12961 bulb in the front side marker position. This is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The 194 is also a T10 miniature wedge bulb, rated at 12V and 3.78W. Although the 12961 and 194 share the T10 form factor, their wattage ratings differ, and substitution between them is not supported by these specifications.
The F-750 from 2000-2003 uses the 194 bulb in both the front and rear side marker positions, making it the only generation in these specifications where a single bulb type serves both locations.
The rear side marker position on the 2017-2019 and 2021-2022 F-750 takes a 3157 bulb, which is a T25 dual-filament wedge type rated at 12V with a 27W high filament and a 7W low filament.
The dual-filament design of the 3157 means it is electrically distinct from the single-filament 194 and 12961 bulbs used in other positions, and the three types are not interchangeable.
The T25 designation of the 3157 indicates a larger bulb body than the T10 used by both the 194 and 12961, which further prevents physical interchangeability across these positions.