Navigator V installation on 2007 RT

I bought a Nav 5 for my RT and mounted it on the RAM mount I had previously used for my BMW Zumo. Since I don't have a 2013 RT, I got the Nav 5 kit that includes the mount that has the 4 extra buttons. This mount has a power cable with two terminals, a three-conductor terminal that plugs into the RT's accessory outlet under the steering head, and a two-conductor terminal fitted with a dummy plug I assume to be for water protection. Does anyone know what this two-conductor terminal is for? I assume it is used on 2013 bikes with the handle bar controls but it could just be there to provide 12v for another accessory. I would like to power my Valentine from this terminal, if possible.

Thanks.

The Nav V is designed to communicate with the rider thru its Bluetooth system. However, there is an audio out from the Nav V. This audio will appear in that aux plug coming from the cradle. Unfortunately, only the navigation directions are sent through this cable; no MP3. MP3's are reserved for the BT system.

Thanks.