What is the blue wire for on trailer wiring?
brake system
The blue wire is the wire responsible for the brake system of the car, and sometimes the reverse lights. In some cases, the blue wire can enable trailers to disable the breaks when they’re reversing (if the trailer uses hydraulic breaks).
Where does the blue wire go on trailer brakes?
Expert Reply: 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.
Which wire is the hot wire on a trailer?
The only wires that could be hot all the time on a trailer connector are the 12 volt hot lead, which is usually a black wire, and, if applicable, the auxiliary power wire, which is normally yellow or purple. The blue wire is usually for electric trailer brakes and if it is hot all the time that would indicate a short.
What color of wire controls the electrical brakes in trailer wiring?
The system hooks into the electrical system by connecting Auxiliary Power (Red wire +12 VDC) to keep the battery charged, the Brakes (Blue wire) to actuate the brakes, and Ground (White wire) to complete the circuit.
What color is the brake controller wire?
The wires exiting the rear of your controller serve the following functions. The blue wires carries the brake output from the controller, the white wire is the ground, the black wire supplies 12 Volt power, and the red wire is tied into the vehicle brake wiring.
What does the blue wire mean?
Blue wire generally refers to a type of wire or cable that is added to a hardware product at a factory in order to resolve design problems. Blue wires are also known as bodge wires in British English.
What does blue wire represent?
Blue Wires – always assume they are live if you have power. Blue wires are also fed through a conduit, usually bringing power to three or four-way switches.
Is a blue wire positive or negative?
Negative
The protective ground must be bare, green or green-yellow striped. Hot (active) wires may be any other colors except these….IEC DC power circuit wiring color codes.
| Function | label | Color |
|---|---|---|
| Positive (of a positive earthed) circuit | M | blue |
| Negative (of a positive earthed) circuit | L- | grey |