I disagree (politely, of course :lol. The reason the wire is so big, is to allow enough current through it. Now if this wire were to get a break in the insulation, that much currently becomes a big problem, real fast.I would NOT put a fuse on the heavy red wire.It could shut you down at a bad time. Like when you pull out in frount of a really BIG TRUCK !! The red wire is big and heavy for a reason.