Alternator wiring

I have read the MAD one and looked thru the other. But in my case the previous owner hooked up the alternator with a 16 gauge wire which is to small and prone to melt. So I just want to replace it with a 8 gauge wire and I don't have to worry about cable melts. That's why i wonder if i could re use the fusible link because i live in Sweden and fusible links doesn't exists. I think I can bypass the ammeter later on if it's fail or I want to connect a voltmeter. But for now i only want to upgrade the small wires to bigger through the firewall in a grommet and not through the bulkhead.