While the basic configuration is a 4 way flat connector that features one female and three male ends you may come across connectors with up to seven pins for additional functions that require wiring including electrically actuated brakes power source for a winch etc. The diagram below shows the view from outside the vehicle socket under the flap and from inside the trailer or caravan plug.
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Wiring a trailer socket. The 7 pin n type plug and socket is still the most common connector for towing. Twin electrics is a 2 plug system which combines the single 7 pin 12n electrics socket with a 12s electrics socket. This is the standard uk wiring of a the normal socket and plug otherwise known as 12n. In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. The trailer wiring diagrams listed below should help identify any wiring issues you may have with your trailer. Australian trailer plug and socket pinout wiring 7 pin flat and round.
Plugs trailer side and sockets vehicle side are available in all standard formats and can be spliced into your existing tow wiring. They often use bonded wires for a reliable connection and have rubber construction to protect. Lets see what types of connectors the trailer light wiring industry uses today. Below is a diagram for the original plug and socket showing the functions of each pin. This has now been replaced by 13 pin euro plugs on all new caravans. I put this here because i had a hard time finding and figuring this out for my trailers.
Heres the wiring diagrams showing the pin out for the plug and socket for the most common circle and rectangle trailer connections in use in australia. Trailer connectors between the trailer and passenger car light truck or heavy trucks with 12v systems in europe both 7 pin iso 1724 and 13 pin iso 11446 are common. Use the 7 pin connector anyway see below and just leave out the last 2 wires. Find the trailer light wiring diagram below that. This supplies power to the road lighting of your trailer or caravan. Trailer plug wiring diagram.
They can be purchased as a standalone plug for the truck or trailer or as a complete loop with both the plug and the socket included. You will need twin electrics if you require more power than what a single 7 pin socket can provide on a pre 2008 manufactured uk caravan post 2008 uk caravans are fitted with 13 pin connectors. If the trailer plug wiring on your vehicle or trailer is damaged or not working correctly you can replace the connector with a curt splice in plug or socket. The 13 pin version being phased in is newer provides more services than the 7 pin a more positive locking and also better protection against moisture and contamination. Our trailer wiring diagram is a colour coded guide designed to help you wire your trailer plug or socket. If your truck has a built in 7 pin socket but you only need 5 of the pins.
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Gallery of Wiring A Trailer Socket
