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Wiring a US trailer to a euro vehicle

You have imported a Defender from Europe and are are super exited with it? Great. 

Now if you try to hook a trailer to your tow ball, you may face a problem as the plug standards are different in Europe and in North America.

We can count mainly 3 different plugs


North America 7 blades plug

7 way wire harness wiring diagram

North America 4 round plugs

4 way wire harness wiring diagram

Euro 7 round plug7 way euro

The main difference between euro and US style is that euro style plugs have distinct wires for brake and turn signal whereas US style have a combined wire.
This can be worked around with a small adapter that will convert/merge the signals



In order to hook a US trailer onto a euro truck, you will need a few items: