I am getting a new 160 amp high output alternator for my 2005 Mazda 3 2.3L. I am running a 1000w amp with two subs. I have the stock alternator in it right now. There are two power cable kits available for me to get. One that has 4 gauge wire with a 100 amp fuse and the other, 1 gauge with 150 amp fuse. Which kit should I get? Can I just add 4 gauge wire along with my stock wire instead of the 1 gauge kit? What are the fuses for and which one would work better? I know nothing about this. Thanks.
A fuse is a necessary circuit protection device, if there becomes a short in the circuit, it can cause a fire, the fuse is a precise conductor which will break if too much current (energy) is being drawn. A 4 gauge wire will work fine, and you need a least a 160 amp fuse, any less and it will blow if your alternator is at full load.
I would go with the 1 ga wire. The fuse keeps the wire from setting your car on fire. The size of the alternator does not matter. The battery should supply 700 amps or so.
