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Posts tagged 7 pin wiring diagram

How to wire a 7 Pin (12 S type) Caravan Plug

Feb19
2013
Written by carbadmin

There are some important differences in the 12S socket wiring in caravans manufactured prior to 1999 and after 1999.  The 12S cable sizes for post 1999 models have been increased to reduce voltage drop and improve load capacity. The car charge line (blue cable) is now left unused, the caravan battery is now charged via the green cable whilst the car engine is running, when the car is not running the green cable reverts to providing a power supply from the car battery, this action is produced from a relay fitted in the caravan. Also the fridge negative has been separated to reduce the loading on the system which unfortunately may cause compatibility issues with some older cars.

12S Wiring Diagram, PRE 1999 (BRITISH STANDARDS)

type 12 S caravan wiring diagram

Pin No. Cable colour Function
1 Yellow Reversing light
2 Blue Ignition positive (for battery charging)
3 White Common Return
4 Green Power feed for internal 12v equipment (not fridge)
5 Brown Spare
6 Red Refrigerator (via relay in car)
7 Black Spare

12S Wiring Diagram, POST 1999 (EUROPEAN STANDARDS)

trailer-plug-type12s-new

Pin No. Cable colour Function
1 Yellow Reversing light
2 Blue Spare
3 White Return for circuits connected to Pin 4
4 Green Power feed for internal 12v equipment or to charge caravan battery via a relay in the caravan (not fridge)
5 Brown Spare
6 Red Refrigerator (via relay in car)
7 Black Return for circuit connected to Pin 6

Please Note: That when wiring the 12S socket, independantly wire Pins 3 & 7 to the car. This increases the wire load capacity and prevents overheating.

Tagged trailer plug wiring diagram

How to wire a 7 Pin (12 N type) Trailer/Caravan Plug

Feb13
2013
Written by carbadmin

In the UK, trailer lights are normallly connected using a 7 pin plug and socket known as a type 12N. If you look at a socket or plug you should be able to see the pin lables (1-7).

In some cases and more often in Europe the trailer light will be connected using a 13 pin plug and socket. If you have a 13 pin socket fitted to your vehicle, adaptors to plug in so you can use a normal 7 pin plug are available.

The table and diagram below explains the connections used on a 7 pin setup.

7 pin trailer plug wiring diagram

Shown from inside the plug

Pin No. Cable colour Function
1 Yellow Left indicator
2 Blue Fog light
3 White Earth
4 Green Right indicator
5 Brown Right tail/side light (& No, plate lamp)
6 Red Brake lights
7 Black Left tail/side light (& No, plate lamp)

Tagged trailer plug wiring diagram

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