RE: Experienced Marine electrician needed
I agree , BUT have a different way of doing it.
Anchor brand wire and terminals , and approved Anchor Crimper, colored insulation to the latest specks and I vastly prefer factory made ends on 04 and other heavy wiring.
I crimp then solder uninsulated terminals on, then cover with heat shrink , but the Anchor are OK.
A CB protects the wires , a fuse AT the user protects the item being powered.
Solenoid , not isolator to charge house banks operated from engine key switch..
You should be able to find a wiring master diagram and simply follow it.