Edit: Just noticed you mentioned 30 series. Info I posted was for a 40 series. So the connector may not even be there on your tractor. 

Previous post I made in this thread with scans out of instruction booklet.

http://talk.newagtalk.com/forums/thread-view.asp?tid=29961

Also the 50 series half moon mounting bracket is much more secure than the 2 strap model shown in the instruction booklet.

http://talk.newagtalk.com/forums/thread-view.asp?tid=36147

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P9170002.JPG (315KB - 67 downloads)

P9170007.jpg (170KB - 62 downloads)

P9170009.jpg (229KB - 64 downloads)

P9170012.jpg (273KB - 81 downloads)

socket.gif (47KB - 66 downloads)