Stop in for a cup of coffee

Remember in our scenario, the battery is fully charged. That's why the purple arrows representing current don't go to the battery in the top drawing.
So lets fix this below by keeping in mind there's no power flowing into the battery.
you now have two lines, one from alternator to the battery with a 14 ga fusible link, one to through the bulk head to the fuse block, then back to the starter relay via a 16 fa fusible link.