In the North American market it is very common for brake lights and turn signals to be combined. On cars and light trucks (listed below as Light Vehicles) there is no formal standard, instead there is a wealth of contacts with more or less accepted standard. However, you can not be entirely sure until you have measured the current connector on the vehicle and trailer that they fit each other. Heavy Vehicles are standardized through SAE J560 which is similar to ISO 1185.
4Way trailer connectors are typically used on small trailers such as boat, snowmobile, utility and other trailers that that do not use brakes. As the name implies, they use four wires to carry out the vital lighting functions. The four wires control the turn signals, brake lights and taillights or running lights. They also provide a wire for a ground connection. 4way trailer connectors are ... Trailer ConnectorsTrailer Wiring AdaptersTesters and Test Equipment
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