Raystar 130 retro kit to C80

[drbridge]

So I just purchased a T70133 kit to replace my failed RN300 system. I have a C80, radar, Auto pilot and st6001 controller and the Failed RN300 that I plan to do away with completely on a 22' C-Dory.
It looks simple enough to hook this up except for the fact that my system has neither a D244 junction block or a R55006 that is shown in the instructions diagram. Instead it has a generic marine terminal bus that the wires from all said components are screwed in to. There is not a dedicated power wire going in to the terminal so I must assume that power is being supplied from either the Auto pilot, C80 or RN300.
I am not sure of how to disconnect the current power input so that I can supply power through the SeaTalkng converter to the system. Any help with this would be greatly appreciated.

Thanks

Doug