The tail light uses a dual-filament 3157 bulb for the running/taillight and brake/turn signals; the reverse (backup) light uses a separate bulb, typically a 921.
In the 2006 Ford F-150, the tail-light housing typically contains two distinct bulbs: one for the tail and brake/turn function and another for the reverse light. While 3157 is standard for the main tail/stop/turn bulb, variations can occur by trim or regional specs, so it’s a good idea to confirm by checking the bulb currently installed or consulting the owner’s manual.
Bulb types by function
The following list identifies the standard bulb types used in most 2004–2008 F-150 tail-light assemblies. Confirm the exact bulb on your vehicle before buying replacements.
- Tail/Running and Brake/Turn bulb: 3157 dual-filament bulb (some assemblies may use a 3157A variant).
- Reverse light bulb: 921 (T15) bulb.
When replacing bulbs, handle them with clean gloves or a cloth to avoid transferring oils to the glass, which can shorten bulb life. If one bulb burns out, it’s common to check the other function in the same housing, as both are part of the tail-light assembly.
Summary
For a 2006 Ford F-150, the tail light generally uses a 3157 dual-filament bulb for the tail/running and brake/turn functions, with a separate 921 bulb for the reverse light. Always verify the exact bulb by inspecting the current bulb or consulting official documentation, as there can be minor variations by region or trim.