Originally Posted by chen123

I bought a non fused distribution block, if that wire won't be protected once it leaves the block as 2 - 8 gauge wires (from 4gauge input) then why do companies such as PG in my case make an unfused block like this?....

Originally Posted by Westec

What you are actually doing is not fusing the "alt" wire. You are protecting the wire in case of an accident. If you got in a frontal collision, you would have an unfused wire directly of the battery that will more than likely start a fire. If you fuse to the campacity of the wire, this is good. You are protecting the wire from shorting not the over drawing. This is why companies like Honda and GM use some sort of fusing, for safety. On GMs there is a "plastic white thing" roughly 6 inches from the "alt" this is a fusible link or one time only fuse. Honda's use a white wire and connect to the fuse distribution center under the hood, it does have a fuse but it is "after" the main input fuse to the distribution center.
Or use add a 150-200 amp in line, you should be fine, if you have a older GM, we will have to adjust things. Hope this helps...