Just Google "standard trailer wiring diagram" and you should find what your looking for. I didn't post my results for a couple reasons: first I don't know if it might be different in your country then it is in the USA. Secondly here there is a loose standard using a 4 pin flat connector and general standard for a 7 pin round connector. You should use what is your countries standard if possible just in case someday someone else needs to tow your trailer or if you someday want to tow someone's trailer. Third, I really suck at trying to cut and paste and usually have to get help! Good luck!