Where do you plug in an electric brake controller?

Using a vehicle-specific wiring harness, plug the brake controller into the vehicle. One end of the wiring harness plugs into the vehicle’s factory harness under the dash, and the other end plugs into the brake controller. The location of your vehicle’s factory wiring harness may vary.

Where does the red wire go on a brake controller?

The red wire on the brake controller connects to the stop light wire on the brake switch located above the brake pedal. You will need to use a circuit tester like # 40376 to probe the wires. You need the one that shows a signal ONLY when the brake pedal is pressed.

How does a brake controller know if a trailer is connected?

Aftermarket brake controllers send a small amount of voltage along the brake output wire, if a trailer is connected, the magnets in the brake assemblies will create a power draw. This power draw tells the controller that a trailer is connected.

What is the difference between a 4 pin and 7 pin?

The only real functional difference between them is that on part # 37185 the 4-pole trailer connector is located to the side of the 7-way, rather than under it as with # HM47180. Both adapters plug in at an existing 4-pole vehicle connector and re-format those lighting signals to the 7-way configuration.

How do you test a trailer brake controller without a trailer?

Press down on the brake pedal while watching the brake controller. The display on the controller should light up and hold a relatively steady reading, which should not vary by more than 1/10 of a volt up and down. It may be necessary to turn the ignition key to the “On” position for this step.

How do you test a breakaway switch?

How To Check Your Breakaway Switch

  1. Disconnect the 7-way trailer cord from the RV to the tow vehicle.
  2. Pull the lanyard pin out to the first stage.
  3. Brakes should audibly engage.
  4. Double check by moving the tow vehicle forward slightly to be sure the RV brakes have locked and are operating correctly.