If you have a Pixhawk, it has 8 "main" servo outputs, and 6 "auxiliary" servo outputs. With 14 connection spots, I don't understand what you mean that you have "only one connector."
Unless there's something going on that I'm not understanding, the documentation will help you decide how to configure the autopilot so that it controls all your servos as you desire. Give it a thorough read-through and attempt to follow it's suggestions.
Perhaps post back here if you read-and-follow it thoroughly, and it still doesn't work for you?