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. Complete with a color coded trailer wiring diagram for each plug type this guide walks through various trailer wiring installation solution including custom wiring splice in wiring and replacement wiring.

Wiring Diagram For Semi Plug Google Search Trailer Wiring
Wiring diagram for 7 pin towing socket. Click on the image below to enlarge it. The first diagram is a simple set up of two brake lights two indicators and two side lights. I put this here because i had a hard time finding and figuring this out for my trailers. I would start by testing the brake output pin on your tow vehicles 7 way 5 oclock position with a circuit tester. The four wires control the turn signals brake lights and taillights or running lights. 4 way trailer connectors are typically used on small trailers such as boat snowmobile utility and other trailers that that do not use brakes.
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. If your vehicle is not equipped with a working trailer wiring harness there are a number of different solutions to provide the perfect fit for your specific vehicle. If your truck has a built in 7 pin socket but you only need 5 of the pins. Twin electrics is a 2 plug system which combines the single 7 pin 12n electrics socket with a 12s electrics socket. 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. Below is a diagram for the original plug and socket showing the functions of each pin.
45 thoughts on australian trailer plug and socket pinout wiring 7 pin flat and round ian. Trailer wiring diagrams trailer wiring connectors. In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. Ensure that there is a good clean earth connection to the vehicle body the 7 pin socket the trailer 7 pin plug and the trailer lamp units. Here are two wiring diagrams for the 7 pin n type trailer electrical plug. In some cases and more often in europe the trailer light will be connected using a 13 pin plug and socket.
4 way trailer connectors are. Use the 7 pin connector anyway see below and just leave out the last 2 wires. Wiring diagram for double relay on 12s socket. Pollak metal 7 pole rv style trailer socket vehicle end 44 reviews code. As the name implies they use four wires to carry out the vital lighting functions. See if you only get power there with the manual.
They also provide a wire for a ground connection. Check and test the fuses on all circuits. Wiring diagram for self switching relay on 12s socket. The table and diagram below explains the connections used on a 7 pin setup. 7 way rv trailer connector wiring diagram. Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller backup lights or a 12v power supply for a winch or interior trailer lights.