Ford F-150 Tail Light Bulb Size

The Ford F-150 tail light utilizes unique bulb sizes WT21/7W, 7440, 3157, 2458, 4057, and 1157 depending on the specific version. Provided information covers the range from 1975 to 2023.

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
2021-2023	WT21/7W
2020	7440 (With Halogen Capsule Headlamps)
2015-2019	3157 (With Halogen Capsule Headlamps)
2005-2014	4057
2004	3157
1988-1998	3157
1975-1987	1157

Bulb Specifications

Description	Bulb Size
Ford OEM part. Dual-filament wedge bulb (T20). Originally used in 2021+ Ford F-150, Bronco, and Maverick. 12V, 21W/7W.	WT21/7W
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	4057
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Ford F-150 tail light specifications span model years 1975 through 2023, covering four distinct bulb types across that range: the 1157, 3157, 4057, and WT21/7W.
The 3157 is the most frequently specified bulb across the F-150 lineup, appearing in model years 1988-2004 and again in 2015-2019, making it the most recurring tail light bulb in these specifications.
The 3157 and 4057 are both dual-filament T25 wedge bulbs rated at 12V, 27W/7W, which means they share identical wattage ratings despite carrying different part numbers.
Although the 3157 and 4057 share the same voltage and wattage ratings, they are not confirmed as interchangeable in these specifications, and the F-150 (2005-2014) is listed exclusively with the 4057.
The 2015-2019 Ford F-150 tail light bulb fitment is conditional, with the 3157 and 7440 specified only for trims equipped with halogen capsule headlamps, indicating that headlamp type is a determining factor in bulb selection for those years.
The 7440 is a single-filament T20 wedge bulb rated at 12V, 21W, and it appears only in the 2020 model year under the halogen capsule headlamp condition, distinguishing it from the dual-filament bulbs used in surrounding years.
The 2021-2023 Ford F-150 uses the WT21/7W, a Ford OEM dual-filament T20 wedge bulb rated at 12V, 21W/7W, which differs from the ANSI-standard bulbs used in all prior model years listed.
The WT21/7W carries a lower wattage on its primary filament (21W) compared to the 3157 and 4057 (27W), which reflects a design difference between the OEM Ford part and the older ANSI-standard T25 bulbs.
The 1157, used in the F-150 from 1975-1987, is the only bulb in these specifications with a BAY15d bayonet base rather than a wedge base, making it physically incompatible with the socket types used in later model years.
The transition from the 1157 bayonet-base bulb to the 3157 wedge-base bulb occurred between the 1987 and 1988 model years, representing a socket-type change that affects physical fitment.