In Europe, both 7pin (ISO 1724) and 13pin (ISO 11446) are common. The 13pin version being phased in is newer, provides more services than the 7pin, a more positive locking and also better protection against moisture and contamination. The connectors are designed for 12V systems. Exceptions for the 7pin connector may exist where they may be used for 6V and 24V.
This 5pin trailer wiring diagram is very good for trailer which has big capacity. However, it does not possess as sophisticated and electric consuming features that RV and other expensive trailers might have. Below is the setup for 5pin connector for greater comprehension. White wires for floor electricity.
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