fuse/electircal system diagnosis

[loudlittlefvkus 10+ year member]

Okay, so today my subs stopped working. the first thing i did was check my fuse. a 120 amp fuse, going to a jl audio 1000/1 slash v2 amp. the fuse was kind of corroded, looked like it was burnt a little on one end (ill post pictures when my phone charges) but the fuse was not blown. then i was wondering, because i think i have a bad ground, which im about to go check out, that was the cause. can a bad ground cause that? i also had a little extra 8 gauge wire grounded from my battery to the chassis if that makes a difference in this. i went back to check my ground, and my RCAs fell loose. could that have caused the problem too? i checked my power wire and there are no breaks or melting, like i said ill post pictures of it all when my phone charges. anyone have any ideas why this might have happened?

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