What is the blue wire on a brake controller?
brake output power
The blue wire is for brake output power to the trailer brakes. One end connects to the brake controller and the other end goes to the pin in the trailer connector on the vehicle side that is for the trailer brakes.
What is the brake light switch connected to?
You can see your brake light switch by looking under the dash, near the top of the brake pedal. The brake light switch is usually attached to a small bracket that holds the switch, activated when the pedal is depressed, in position.
What is blue wire on trailer?
It is an auxiliary wire typically used to connect the reverse lights from the tow vehicle to the reverse lockout solenoid located directly behind a surge brake actuator. When properly connected it allows you to disengage the trailer brakes in order to back the trailer up (without getting out of the vehicle).
How does a pressure brake switch work?
The air brake system does this with an electric switch that works by air pressure. The switch turns on the brake lights when pressure is applied to the brake pedal. Second, it sends the signal to the vehicle computer that brakes are applied. In most cars, the brake light switch is installed right above the brake pedal.
How do I test the blue wire on my brake controller?
If your brake controller is receiving power, set the power gain to maximum voltage and sever the blue wire about 6 inches back from the brake controller. Using a circuit tester, like part # 40376, test the blue wire for power when you activate the manual override of the brake controller.
Why is there no power on the blue brake output wire?
If there is no power on the blue wire when the manual override is activated, the brake controller is probably bad and would need to be replaced. If you have a proportional brake controller and are testing for power when the brake pedal is pressed, there will be no power on the blue wire.
Which is wire is supposed to be hot to the brake light switch?
I’m talking about the two wire which comes out of the main harness with a blue and orange one and plugs into the regular brake switch at the top of the brake pedal. One is supposed to have 12v at all time the other only gets power when the pedal is depressed.
How do you replace a brake light switch on a Harley?
Unscrew and remove the right turn signal switch and cut any necessary tie wraps. Now you can remove the brake light switch shim (on most models) and remove the damaged switch. When removing the damaged switch, cut the wires at the switch, leaving you the most wire possible to work with.