Ford 3rd brake light wiring

Where to connect a camper shell third brake light on Ford trucks. Red (+) to the CHMSL wire, clear (−) to ground.

2015 and newer Ford F-150

Location 1: under the driver's side kick panel. The CHMSL wire is purple/white. Remove the factory black tape to expose it.

Location 2: under the hood on the driver's side. Also purple/white.

Connect the red (+) lead on the brake light to this wire. Connect the clear (−) lead to ground on the metal frame (not the body).

Location: under the passenger side step plate. The CHMSL wire is light green.

On 2009 and later models the CHMSL wire is under the hood on the driver's side, also light green.

Connect the red (+) lead to this wire. Connect the clear (−) lead to ground anywhere on the frame or body.

Location 1: the red wire on the pigtail behind the driver's side tail light. Remove the tail light to reach it.

Location 2: above the brake pedal. The wire is white with a purple stripe.

Connect the red (+) lead to this wire. Connect the clear (−) lead to ground on the metal frame (not the body).

Location 1: the green wire in the factory harness beneath the center console.

Location 2: if the green CHMSL wire isn't in that harness, remove the driver's side step plate and find it beneath the driver's seat.

Connect the red (+) lead to this wire. Connect the clear (−) lead to ground anywhere on the frame or body.

Wire colors and locations can vary by trim and model year. Always confirm with a test light before connecting.

Need the light?

LED 3rd brake light for A.R.E., Leer, ATC, Astro, Jason and Century caps.