7 Pin ‘S’ type caravan wiring
7 pin ‘S’ type plugs and sockets are usually used on caravans to supply power to the reverse light and give auxiliary power to other systems such as fridges, internal lights and charging systems. This was replaced in 2008 by the 13 pin Euro plug on all new caravans.
It is recommended that a split-charge relay should be wired into your ‘S’ type caravan wiring. At a set voltage this relay will divert the power that usually charges you vehicles battery to the auxiliary systems in your caravan. This is useful for charging auxiliary batteries and powering appliances like fridges and freezers while you are driving. Click here for more information on split-charge relays.
Below is the wiring diagram for this plug and socket.
| Pin No. | Colour | Function |
|---|---|---|
| 1 | Yellow | Reversing Light |
| 2 | Blue | 12v ignition on (battery charging) |
| 3 | White | Earth for terminal 2 and 4 |
| 4 | Green | 12v Permanent (Direct from battery) |
| 5 | Brown | Revising sensors (usually spare) |
| 6 | Red | 12v ignition on (Fridge) |
| 7 | Black | Earth for Terminal 6 |
Other wiring diagrams on this site are listed below:
7 Pin ‘N’ Type trailer plug wiring diagram.
13 Pin Euro plug wiring diagram.
Split-charge relay wiring diagram.
7 way universal bypass relay wiring diagram.
To purchase electrical components for towing please visit – www.towingandtrailers.co.uk
There are 5 Comments to "7 Pin ‘S’ type caravan wiring"
hi i was looking at ur diagram and wondering if terminals 2 and 6 could be linked out as they do the same job and is it ok to earth terminals 3 and 7 at the same point on the towing vehicle ?? thankyou mike
These could be linked if you used a heavy enough supply / Return cable but the 7 core S type cable would not be suitable.
Just run the 2 earth wires to a good earth point put ring tags on each one this shares the load.
hi,i have a car tranceporter trailer with a winch with own battery & want to connect a charging system to battery ,would i be right in thinking to conect the blue to live of batt & white to earth,regards nigel
Yes this is correct when using the ‘S’ type plug. If you try this with the ‘N’ type plug it will not work.
Thanks.