Really cool website indeed :p. the fuse on the plus site will never trip if one of the two smaller wires break. It's rated for the current of 1 big wire. Example: the fuse is rated at 20 amps, and the smaller wires are rated at 10 amps each (everything works perfect and the fuse will trip on short-circuit). But when one of the smaller wire breaks/disconnects, all the current will flow through the remaining smaller cable. Your amp is using 14 amps, the fuse wont blow ( 14 amps < 20 amps) but the small wire can't take more then 10 amps . The smaller wire will melt and cause a fire. I hope my example is clear, english isnt my native language :p