Ford F-750 Back Up Light Bulb Size

The Ford F-750 back up light utilizes bulb sizes 3157, 1156, and P21W depending on the specific version required for the vehicle. Available data covers a range from 2000 through 2022 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
2021-2022	3157
2017-2019	3157
2000-2003	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Ford F-750 back up light specifications cover model years 2000-2003 and 2017-2022, with two distinct bulb types appearing across those periods.
The 3157 is the bulb type specified for the Ford F-750 across the 2017-2022 model years, making it the more recently adopted of the two types in these specifications.
The 3157 bulb is a dual-filament T25 wedge type rated at 12V with a 27W/7W power split between its two filaments, conforming to ANSI standards recognized in both the US and Canada.
The dual-filament nature of the 3157 means it carries two separate circuits within a single bulb, which is a key electrical characteristic that affects socket and wiring compatibility.
The 1156 is specified for the F-750 across the 2000-2003 model years and operates as a single-filament bulb rated at 12V and 21W.
The 1156 uses a BA15s bayonet base, a single-contact bayonet mount, which is physically and electrically distinct from the wedge base of the 3157.
Because the 3157 uses a wedge base and the 1156 uses a BA15s bayonet base, the two bulb types are not interchangeable between the model year groups covered in these specifications.
Both the 3157 and 1156 conform to ANSI standards applicable in the US and Canada, placing them within a standardized North American automotive lighting classification system.