Do wire harness adapters exist for After-market harnesses?

[Firetruck 10+ year member]

I have 4 speakers wired to an after-market HU, and I believe the wire harness is in place is an after-market harness. Now I wanna wire the speakers to an amp for more power

I was talking to some dude who worked at BestBuy and he said that cause it's not the original harness, I'm stuck w/ cutting all the wires, crimping them to long ass speaker wires and sticking them straight onto the amp, few questions...

I heard that there is a harness adapter I could use, can someone link me?

is the AL, AR, BL, BR where the speaker wires go if I choose to go w/ the guy's advice?

Do I just use 22 gauge wire, or try 16, can you crimp 16 gauge wi4res to the tiny stock speaker wires?

Do I needa put those ring-crimps on to the end of the speaker wire, or just strip it and stick it into the screw/plate device?

Thanks in advance

Oh and lastly...on my amp it's got two green rectangles stickin out a bit, each labeled 30A, so my amp's total fuse rating is 60A right? Therefore I need a 60A fuse on my power wire?

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[bigmandengo 10+ year member]

you should just have to run rca cables from the hu to your amp not speaker wires from the hu. then you run speaker wire from the amp to the speakers

 

[Firetruck 10+ year member]

oh i meant like, disconnect the speaker wire harness from the HU then from that point run them to the amp, it'd take a lot of re-wiring to get them from their door/roof locations to the amp right?

 

[pensacol 10+ year member]

What he's saying is that since you have an aftermarket H/U you won't need to splice speaker wires. You would get a set of RCA's and plug them into the back of your H/U and then plug them into the input jacks on your amplifier.

 

[bigmandengo 10+ year member]

just leave your stock speaker wires in place and run new ones from the amp to the speakers