Are there different versions or standards for European style trailer connectors?

There are different versions or standards for European style trailer connectors, which are commonly used in Europe for towing trailers and caravans. The most common types of European trailer connectors include the 7-pin and 13-pin versions. Here's an overview of these standards:
7-Pin Connector: The 7-pin connector is the older and more widely used standard in Europe. It consists of seven pins or terminals that provide connections for various electrical functions. The pins are typically labeled with numbers or symbols representing specific functions such as:
Pin 1: Left indicator/turn signal
Pin 2: Rear fog light
Pin 3: Ground/earth
Pin 4: Right indicator/turn signal
Pin 5: Right taillight/stoplight
Pin 6: Left taillight/stoplight
Pin 7: Auxiliary power or reverse light (optional)
13-Pin Connector: The 13-pin connector is a newer standard that is gradually replacing the 7-pin connector in some European countries. It provides additional functionality and simplifies the wiring process. The 13-pin connector includes the same functions as the 7-pin connector, with the addition of:
Pins 8 to 13: Additional functions such as refrigerator power, reverse light, brake lights, and battery charging.
The 13-pin connector is designed to be backward compatible with the 7-pin connector, meaning that a 13-pin socket can accept a 7-pin plug, but not vice versa. The advantage of the 13-pin connector is that it consolidates the connections into a single plug, making it easier to connect and reducing the risk of incorrect wiring.
It's worth noting that the specific wiring configuration and color-coding of the pins may vary slightly between different European countries. It's important to refer to the wiring standards and regulations in your specific country or region to ensure proper installation and compatibility with towing equipment.
When connecting a European trailer to a vehicle with a different style of trailer connector, such as those used in North America, adapters are available to facilitate compatibility between the different wiring systems.