Towbar Electrics: The Definitive Guide | Witter Towbars

A towbar wiring bypass relay can be fitted between the towbar wiring and vehicle wiring to prevent too much power from being taken directly from the vehicle battery. In most modern vehicles, one connection point could operate various systems and a universal wiring kit is not sophisticated enough to accommodate complex electrical systems.

The brown pin 5 in most cases is not used when wiring tow bar electrics and it is important to ensure that the white pin 3 cable is earthed.. In some cases a split charge relay might be needed in order for the power to switch divide from charging a leisure battery and the car battery.

A diagram of a tow bar electrics bypass relay. Wiring diagrams an important aspect of towbar fitting is the wiring which is required to power either your trailer lights or caravan internal electrics. 7 pin n type 12n trailer plug socket wiring diagram trailer 12n wiring diagram full size of witter towbar electrics wiring diagram 7 pin towing plug archived on fantastic towbar electrics wiring ...

Towbar Wiring Guides . Listed below are some basic 12N and 12S type wiring diagrams that will help in vehicle wiring for both road lights and caravan internal electrics. Alternatively, we are willing and able to look at any wiring problem here at our workshops. WIRING DIAGRAM FOR 12N TYPE 7-PIN Black socket or plug for vehicle road lights

Some newer vehicles with multiplex wiring may need the addition of a bypass relay kit (see Relay section for more information). 12S Caravan Socket 12S electrical kits (socket with grey cover) are used predominantly for operating internal appliances within a touring caravan, i.e. running of caravan 12 volt fridge, charging leisure battery and offering a permanently live 12 volt feed into the ...

The relay works by picking up the signals to the lights on the rear of the vehicle and converting them to direct 12v from the 12volt feed. This does not draw the power from the lighting circuit on the car which stops any overloads on wiring circuits and is not picked up by the monitoring system on the vehicle.

TEC3M terminals (2) no connection, (4) to pin 9, (6) to pin 10 of the Towbar plug. Ground wires - Green/white to pin 13, Blue/white to pin 11, White to pin 3.

For use with non-multiplex towbar wiring installation, the audible flasher monitor relay is fitted inline with the N-type socket on the indicator circuits. The monitor sounds in time with the turn signals when the trailer or caravan is plugged in, to provide an audible confirmation of correct turn signal operation.

2) You will notice that there are 8 (9 on some relays depending on manufacturer) wires coming out from the relay which apart from the grey wires, match the colours of the wires in the black 7-core cable. These colours are the standard colours for towbar wiring - unfortunately there is no such standard for vehicle lighting wiring colours. An assistant sitting in the driving seat is useful at ...

Towbar Wiring >> Towbar Wiring 13 Pin Fitting Instructions for all 13 Pin Kits and Relays Take the 13-core cable into the boot through a 9/16" hole into which you have inserted the grommet provided.