Ford F-150 tail light wire colors explained
Tail light wire color code for Ford F-150 trucks, what each pin does, and the digital-control caveats for 2022+ models including the F-150 Lightning.
The original article was titled for the F-150 but described F-250 wiring (Ford uses essentially the same colors across F-Series). For a 2008 to 2020 Ford F-150 or Super Duty, the rear seven-pin trailer connector and the truck’s own tail light wiring follow this pattern:
| Function | Pin | Wire color |
|---|---|---|
| Left turn / brake | 1 | Light green / orange |
| Right turn / brake | 2 | Orange / light blue |
| Ground | 3 | Black |
| Running / tail / license plate | 4 | Brown |
| Reverse | 5 | Black / pink |
| 12 V auxiliary (7-way only) | 6 | Black / white |
| Electric brake (7-way only) | 7 | Green or center high-mount stop / accessory |
The seven-pin connector on the back of the truck and the wiring inside the tail light housing share these colors. The function-to-color mapping is consistent across F-150 and Super Duty model years from roughly 2008 through 2020.
The catch for 2022 and newer trucks
Starting with the 2021 F-150 (14th gen) and continuing through 2026 F-150, F-150 Lightning, and Super Duty, Ford uses a digitally controlled tail light system. The rear lamps are driven by a body control module (BCM) and the Smart Junction Box (SJB), not by simple 12 V on/off wires.
What that means in practice:
- Splicing aftermarket accessories (trailer wiring, custom LEDs, light bars) directly into the tail light wires can throw codes, disable lights, or trigger fault messages on the dash.
- The wire colors are still standardized, but you cannot tap them with a quick-splice connector the way you would on an older truck. You need a T-One vehicle-specific harness that plugs into the factory connector.
- Aftermarket LED replacement assemblies need to be “CAN-bus aware” or the truck will throw a “trailer light not detected” or “rear lamp fault” warning.
For a 2021 to 2026 F-150 or Super Duty, buy a Curt 56523, Tekonsha 118247, or equivalent T-One harness. These plug into the factory 7-way connector under the bed and tap the digital signals without modifying anything.
What each wire actually does
Ground (black)
All electrical circuits need a return path to the battery negative. The truck’s tail light wiring uses a dedicated ground wire (usually solid black, sometimes black with a yellow, green, or orange stripe) that connects to the same chassis ground point as the rear bumper and trailer plug.
If trailer lights are flickering or dim but truck lights are fine, the trailer plug ground is the first thing to check. The pin corrodes faster than the others because it sees the most current.
License plate and running / tail lamp (brown)
Brown carries the running light circuit, which feeds the rear tail lamps, the license plate light, and any clearance lamps. When you turn on the headlights, brown is hot.
Reverse (black/pink or solid pink on some years)
Hot only when the transmission is in reverse. Lights the backup lights on the truck and, on a 7-way trailer connector, can be used to disable a hydraulic surge brake actuator on a boat trailer.
On 4-pin trailer plugs (most utility trailers) the reverse pin does not exist. The trailer cannot signal reverse to anyone behind it.
Left turn / left brake (light green / orange)
This wire carries both the brake light signal and the left turn signal. When you press the brake pedal, both rears get 12 V on this pin. When you signal a left turn, only the left side blinks. On a few trim levels with separate amber turn signals (most pre-2020 F-150 do not have amber rears, but a few markets do), the brake and turn are on different pins.
Right turn / right brake (orange / light blue)
Same as left turn but for the right side.
Center high-mount stop lamp (green or extra hot wire)
The brake light at the top of the cab. Driven separately from the left and right brake lights. If your left and right brake lights work but the cab-top one does not, the center wire or its bulb is the issue.
Common F-150 tail light problems
| Symptom | Likely cause |
|---|---|
| All trailer lights dead | Truck’s 7-way ground or fuse |
| Trailer left turn works, right turn does not | Right turn wire (orange/light blue) at trailer plug |
| Brake lights on truck work but not trailer | Brake wire splice or 7-way pin |
| Random trailer light faults on 2021+ truck | Open recall 26C10 (NHTSA 26V104000), see below |
| Tail lights work, brake lights dead | Brake light switch at pedal |
Ford recall 26C10 (NHTSA 26V104000)
In early 2026, Ford issued recall 26C10 covering roughly 4.3 million vehicles for an Integrated Trailer Module (ITM) software fault that can disable or scramble trailer light and brake signals. Affected vehicles:
- F-150: 2021 to 2026
- F-Series Super Duty: 2022 to 2026
- Ranger: 2024 to 2026
- Expedition: 2022 to 2026
- Maverick: 2022 to 2026
- Transit: 2026
- Lincoln Navigator: 2022 to 2026
Ford pushed an OTA software fix in March 2026. If your truck has been receiving OTA updates and is connected to FordPass, it has likely already been patched. If not, the dealer will apply the fix at no charge.
If you have unexplained trailer light issues on a covered truck, check recall status at NHTSA.gov with your VIN before chasing wiring problems.
When to call a pro
For most pre-2020 trucks, tail light wiring is DIY territory. A multimeter, a test light, and 30 minutes of patience will diagnose most failures.
For 2021 and newer trucks with the digital tail light system, the calculus is different. Splicing into the digital wiring without the right harness can trigger faults that require dealer-level reset. Buy the T-One harness, plug it in at the factory connector, and skip the splice work entirely.