7-pin N (ISO 1185)

Definition: 7-pin N (ISO 1185)

What does a 7-pin N connector do?

The roads are getting busier every day. There are more and more cars, but also more and more trucks with trailers on the road. For traffic safety, it is therefore important that every vehicle is well lit. Trailers will also need to be lit, but without electricity, lighting will not work. The electricity therefore needs to be led from the truck to the trailer. This is done by using a 7-pin N plug in combination with a 7-pin S plug. These plugs have been specially designed for the truck and trailer sector and do not fit on other vehicles like small trailers, unlike the normal 7-pin connector.

Different ways of connecting

In order to supply a trailer with electricity, a connection to the truck has to be established. This can be done in two different ways. Firstly, the 7-pin S and 7-pin N plugs can be used. These should both be connected from the truck to the trailer. If only one plug is used, not all the lighting will be powered. The other way of connecting is to use a 15-pin connector (ISO 12098). This is the same principle as a 7-pole plug, only there is no need to connect two cables, only one.

Difference 7-pin N and 7-pin S connector

A 7-pin N and S plug both supply a trailer with electricity for its lighting. These cables are not the same and both supply different lamps with electricity. To create a clear picture, the diagram below was created. It is easy to see which plug supplies which lighting.

7-pin N

  1. Mass
  2. Rear, contour, width and license plate light left
  3. Indicator left side
  4. Brake lights
  5. Indicator right side
  6. Rear, contour, width and license plate light right
  7. Checking the trailer brake

7-pin S

  1. Mass
  2. Not allocated
  3. Reversing light
  4. Constant power supply (+24V)
  5. Control for mass
  6. Power switch
  7. Rear fog lamp

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