Interesting schematic. I don't understand the 14 gauge link protecting the charge circuit nor the 16 gauge link protecting the dash feed. Are they not too light? And, why do you need the red and black wire spliced on the dash side of the bulkhead?
Fusible links are not copper wires.
They are sized to overheat and melt FIRST in the event of continuous over-draw like a short-circuit; but will survive many momentary over-draws, so you don't get stranded on the hiway. A regular fuse here would pop in mere seconds or even milliseconds, leaving you no diagnostic time after the sun goes down, so then you are left stranded 'til morning.
I experienced a fusible-link meltdown once, early in the morning on the way to work. I just happened to have a fuse-holder in my emergency repair kit, so a couple of minutes later, it was installed and blowing fuses. I cut out the offending culprit, but it still required a 40A fuse to continue driving.
I fixed it a few days later, after work, by replacing the F-link and offending item.
F-links are just slow-blow fuses, sized to prevent large over-draws from setting your car on fire..... yet allowing momentary overloads to prevent you being stranded.
