question wiring my amp

[cocoleveo7686 10+ year member]

i currently upgraded my amp to a hifonics bxi2006d, i was running 4 gauge wire before to the previous amp, i was going to get 0 gauge but my local car audio store told me to just run another line of 4 gauge and a fuse for each wire. Now my questions are, when i have the car running and playing on almost 3/4 volume my voltage goes to about 12.2-12.5, i have a 110A alternator and the grounds done out of the big 3, havent done the positive to alternator yet, if i switch out the 2 4 gauge wires with 0 gauge, would that help alot? is it even worth it? i know i probably need to get a bigger alternator, but money is tight right now, i was just wondering if it would make my amp see alot more voltage thanks!

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[hemi=22s 10+ year member]

upgrade the postive batt, alt wire first before upgrading to 0 ga

 

[cocoleveo7686 10+ year member]

upgrade the postive batt, alt wire first before upgrading to 0 ga

ok i will do that, and use 0 gauge for the positive to the alternator, but im confused, they say fuse it to the wire, and that would be 200+ amp fuse, but my alternator is 110A, and say something happens wont it blow my alternator before it will blow the fuse? thanks in advance