High Amp Alternator and Accessories Questions

Fuse 2 needs to protect the wiring --needs to be sized appropriately for that and I would not power fans and other heavy stuff off "downstream" of the interior. Maybe add "fuse 2 and ""2a" What you really need is something like modern car distro bloks where you can have a ?? no4 or so feed with a master fuse link and then individual fuses from there

If you are killing stuff through the ign switch, power down the relay coils, not the main feeds to the relays.