https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwicvP6V4b3UAhUW24MKHe85DuQQjRwIBw&url=https%3A%2F%2Fwww.allpartsstore.com%2FItemDetl.htm%3FItemNumber%3DRE51091&psig=AFQjCNF9FtXd1cLEEbTMLSQzw6X8uibkPQ&ust=1497544171876991You can find this plug on a lot of tractors 30 years old and newer. 12v switched, unswitched, and ground
Auxiliary power ports available on most tractors
