T&T: 120V green ground conductor

[paul schlechter]

Hi All,
Having recently purchased a 1963 Cheoy Lee Troller, I will be updating the
current 120v system.  Currently there is no distribution panel, only what
appears to be an automotive type fuse panel coming directly off the incoming
30A shorepower outlet. 
 
I plan on removing this completely and installing a new incoming 30A
receptacle to a new Blueseas distribution panel with a galvanic isolator in
the ground connection.  I must add that this is a wood boat. 
 
My question is about the green 120v ground wire.  Based on all I've read this
should be connected to the ships 12v negative ground.  As I will be locating
the new 120v panel adjacent to the current 12v panel, can this 120v green
ground simply be connected to the negative terminal in the 12v panel or should
a separate ground wire be run from the new panel to the 12v negative battery
connection at the engine?

Paul Schlechter
31' Cheoy Lee Monterey Clipper Troller "Tortuga"