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Tow Bar Electrical Sockets...
Single Electrics, also known as 12(N), are fitted as standard. They provide power from the towbar to the lights on a trailer or caravan. If you're only going to be towing a trailer this is all you need. You can tow a caravan using only single electrics, but the interior functions of the caravan, such as the fridge, wouldn't have power to them. Even if you will only be using the towbar for a cycle carrier we recommend that you still have a single electric socket fitted so that you can power a light board over the bikes.
Twin Electrics, or 12(S), are fitted in addition to single electrics if you're going to use your towbar for towing a caravan built prior to 2008. The extra grey socket provides power to operate the interior functions of the caravan such as the interior lights, run the fridge and charge the battery while you are towing. This type of socket has been replaced on caravans built after 2008 in the UK. New caravans now use the 13 pin standard socket.
13 pin Electrics have been standard in most other European countries for some time. This is replacing the 2 separate socket currently used in the UK. The 13 pin socket is essentially the two 7 pin sockets merged in to one. All caravans manufactured in the UK from 2008 are fitted with an ISO 13 pin connector as standard. This system uses one socket with 13 pins inside, instead of the traditional two separate 7 pin sockets. 13 pin sockets are also used on some vehicles especially with detachable towbars when there isn't enough room to mount two separate sockets behind the bumper.
Unit 1, Branksome Buisness Centre
Cortry Close (off Sharp Road)
Branksome Poole BH12 4BQ
Mob: 07557 275388