The Ford F-600 Super Duty brake light requires a 3157 bulb size for proper installation and function on the vehicle. Data for the specific component covers the range from 2020 through 2022.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford F-600 Super Duty uses the 3157 bulb for brake lighting across the 2020-2022 model years.
The 3157 is a dual-filament wedge bulb classified under the T25 form factor, operating at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament, making it suitable for combined stop and tail light functions.
The 3157 conforms to ANSI standards applicable in both the United States and Canada.
The Center High Mount Stop Light on the 2021-2022 F-600 Super Duty uses the 912 bulb rather than the 3157 found in the primary brake positions.
The 912 is a single-filament wedge bulb classified under the T15 form factor, operating at 12V and 12W.
The 912 is a variant of the 921 bulb. While the two share a physical form factor, they differ in wattage, and substituting one for the other without confirming electrical compatibility may affect circuit performance.
The 912 also conforms to ANSI standards for the United States and Canada.
The T25 and T15 designations refer to the outer envelope size of each bulb, with T25 being physically larger than T15, meaning the two bulb types are not interchangeable despite both using a wedge base.