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Mega fuse ? Doesn't that kill the battery if it's stuffed - basically like connecting terminals - which would explain the battery losing so much charge.
Also pretty sure unless you have a Traxide dual battery kit or condition charge the battery each week it's probably well below 80% soc being used in a disco
A blown starter mega-fuse wont cause any damage to anything but the starter wont operate because of no power and probably also because its dead, being the likely cause of a blown mega-fuse.
Update:
Replaced Alternator with aftermarket from a client of mine in Sunshine.
Everything working and OBD2 reports live voltage around 14.7V
The original replacement was from AlternatorMan in the UK...
Unsure as to cause of its issues....