Trailer Wired Leader

It is possible to hardwire an Elecbrakes Trailer-Wired-Leader (TWL) directly to the trailer plug or harness, taking note of the pin number and colour coding as per our wiring diagram:

https://www.elecbrakes.com/wiring-diagrams/

Within the trailer plug that connects to the tow vehicle socket, the service brake (blue wire) must be joined to create a closed circuit from the brake controller (blue wire) to the brake magnets via the trailer harness (blue wire).

Taking note to not connect this to Pin 5 within the plug. This will ensure the brake controller remains in control of the service brake circuit without any external influence from different tow vehicles.

In most instances, ensuring the in-car system has been adjusted to 0 will result in no conflicting signals reaching the trailer brakes.

• EB2: when installed using an Elecbrakes adaptor, the service brake circuit will receive input from the Elecbrakes brake controller only. The adaptor will have Pin 5 terminated on the vehicle side to prevent other signals reaching the trailer brakes.
  
• Trailer wired leader: As per our wiring diagram: https://www.elecbrakes.com/wiring-diagrams/
  The leader should be joined directly to the trailer’s service brake circuit only, keeping this circuit separate from Pin5 to prevent other signals reaching the trailer brakes.
• VM1: When connecting the VM1 wiring to the tow vehicles socket, any existing wiring connected to Pin 5 should be removed and terminated, ensuring the only output applied to Pin 5 is from the Elecbrakes brake controller.

When using a 7 pin plug/socket, an optional light duty auxiliary may be provided via Pin 2, suitable for up to 15 amp capacity when factoring the combined lighting circuit current draw.

This can be sourced from the tow vehicles battery or ideally, an ignition triggered fuse block. When routing an auxiliary supply to the vehicle socket, please ensure a 20 Amp inline fuse is installed.

For reference, wiring diagrams: https://www.elecbrakes.com/wiring-diagrams/

Vehicles equipped with a 12 pin socket may already have auxiliary power provided to Pin 9 and additional earth via Pin 10.

When advised by your trailer manufacturer of accessories installed that require an auxiliary power/earth supply, or, if the trailer is equipped with a 12 pin plug, it may require auxiliary circuits to be provided via the tow vehicle / socket. The additional auxiliary circuits may be added to the tow vehicle via pins 8-12.

In this scenario, we recommend the use of a 12 pin to 12 pin adaptor to allow throughput of the auxiliary circuits.

Reference to our 12 pin wiring diagrams: https://www.elecbrakes.com/wiring-diagrams/

In some cases, an Anderson plug may be required if the accessories installed have a current draw exceeding 30 amp peak. Please follow the manufacturers recommendations to add the required Anderson plug/circuit.

Elecbrakes brake controllers are compatible with 12V and 24V DC vehicles, requiring a minimum input of 10V. The functional input voltage ensures that there is adequate power received from the tow vehicle to engage the brakes appropriately.