Towbar Wiring | 12N Wiring

Before you start

Examine the car carefully to see that all electrical circuits are working correctly and that no warning lights are showing.

Decide whether to disconnect the battery. Take into account:

  • Would disconnection disrupt memory circuits, etc? (You may need a device to keep memory circuits )
  • Can you make your electrical connections safely with the battery connected?

General Instruction, 12N boot fitting relays and monitors

  1. Drill a 12mm hole in the floor of the boot adjacent to the socket mounting point on the towbar. (Take great care to ensure that you drill in a safe place where you will not damage wires, pipes, bodywork, etc.) Treat the edges of the hole with a rust inhibitor and line it with the grommet provided.
  2. Wire the trailer socket, as shown in Chart A and mount it on the towbar. Lead the 7-core cable into the boot through the hole you drilled. Make sure the cable is a snug fit in the grommet to prevent fumes coming into the car.
  3. Use a suitable probe tester to identify which wire feeds each rear lamp.

    If you need to take a power source for a bypass relay, etc.

  4. Route your power source cable(s) from the boot to the battery. Fit a fuse in line in the cable, close to the battery. Do not connect yet .
  5. When routing the cable, take care to route it where it will not be cut or crushed. Pay particular attention to points where the cable passes through bulkheads, etc.

    In all cases
  6. Follow the instructions in Chart A and connect together your 7-core cable, your relay(s) and/or monitor and the appropriate wires in the vehicle loom.
  7. If applicable, connect your power cable to the battery and insert the fuse provided. Check that the fuse is of the value shown in Chart A.
  8. Use a suitable test board to test the circuits, preferably with the alternator charging. Make sure any "Tell-tale" warning light or buzzer is working correctly.

CHART A

Socket
Pin No.		 7-core cable
colour		  to  Relay wire
colour or
terminal No.		 Relay wire
colour or
terminal No.		  to  Vehicle Circuit
1 Yellow to See relay details to LH Flasher
2 Blue to See relay details to Fog Lamp
3 White to Chassis White to Chassis earth
4 Green to See relay details to RH Flasher
5 Brown to See relay details to RH tail light
6 Red to See relay details to Brake Lights
7 Black to See relay details to LH tail light