Socket and plug are keyed. Or as a complete loop with both the plug and the socket included.

Wiring Diagram Electrical Connector Trailer Connector Ac
Trailer plug socket wiring diagrams. A colour coded trailer plug wiring guide to help you require your plugs and sockets. The first diagram is a simple set up of two brake lights two indicators and two side lights. They often use bonded wires for a reliable connection and have. 12n 7pin trailer caravan lighting wiring diagram. In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. This is the standard uk wiring of a the normal socket and plug otherwise known as 12n.
Includes guides for 7 pin 6pin 5 pin 12 pin 13 pin pin and heavy duty round plugs and sockets. Use this handy trailer wiring diagram for a quick reference for various electrical connections for trailers. 1st august 2017 by western towing. Here are two wiring diagrams for the 7 pin n type trailer electrical plug. 4 5 way flat connector wiring diagrams. Use the 7 pin connector anyway see below and just leave out the last 2 wires.
Plug size is similar to an australian 10c coin. Small 7 pin round qld identifying. All diagrams are as viewed from the cable side see example above. International 1 989 755 0561 toll free 1 800 358 4751. If your truck has a built in 7 pin socket but you only need 5 of the pins. The diagram below shows the view from outside the vehicle socket under the flap and from inside the trailer or caravan plug.
Click on the image below to enlarge it. The second diagram shows two brake lights two indicators two side lights and a fog light. There is a noticeably larger gap between 1 and 6 on this plug though some trailer places rotate this connector that the yellow is at the top.