Electrical Plug Diagram. 2 or more circuits. The nema 2 15 range of connectors have been effectively discontinued for some time.
The blue neutral wire bl bottom left goes into the hole in the bottom left when the three pins of the front of the plug are facing away from you. The hot wire carries. Such as sealed electronic power supplies are still sold with both pins narrowthe neutral insertion point in the modern type a socket is wider to accommodate polarized type a plugs.
The second diagram shows two brake lights two indicators two side lights and a fog light.
Here are two wiring diagrams for the 7 pin n type trailer electrical plug. Electrical switch diagrams that are in color have an advantage over ones that are black and white only. If you are just replacing a damaged plug you will probably only need a screwdriver. Wiring an american plug is no more difficult than wiring a uk or european plug.