I am not real knowledgeable so I can not answer that directly, but your manual will tell you what each pin is for?
Do you need a new 9 pin? What seems to be the reason for wanting to change? If I can help I have a local guy that has a 9 pin in his shop, pm me if you need one. I don't get on this everyday so I may not read any responses here. I would like to know what some of the more experienced people have to say about this topic. Good Luck!
McLogger, AIR # 16452
1973 27' Overlander