what size megafuse?

Or, use a fusible link wire four gauge sizes smaller than a properly sized charging wire (by alternator ampacity) on the charging circuit and use an AGC fuse block on the battery positive for the small circuits.

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For starters I could go 4 sizes smaller fusible link IF the 12 gauge output wire is the right size. I will call O'reillys & see if they can full field an alt for max capacity amperage. I am running a large cable from battery to the main of/off switch "in" terminal & the other "out" terminal with a large cable to the starter & everything else is also fed from the out terminal but I could switch the starter cable to the other side so the starter is hot all the time if this would be a good move keep everything else seperate & then I could fuse the "out" terminal that powers the rest of the system. I'm out of my league here!. RR