In essence it goes to the ECU but this is via the can hi and low wires, just needs a normal interface. if its quadlock CTSST001 with patch lead for whatever brand
youve contradicted yourself saying it buzzes when the sub is connected and it doesnt when the sub is connected which is it?
RCA earth tracks are common to blow on these, there are ghetto ways round it (as a repair wont be cheap)
i cant remember off top of my head but pretty sure the 2nd fuse is a 15 amp that is completely unrelated, you can see if you just shine a light over the area of the fuse
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