How do I figure out what size fuses to get for my system.

[vaa]

So I'm upgrading my stereo in my car. It's a 2002 Civic. I will be doing the big 3 upgrade. I have a ED nine.1 for my sub and a Rockford P400-4 for the rest. The Rockford says it needs an 80amp fuse up by the battery. The Nine.1 has 120A worth of fuses on board. I'm wondering what size fuse I need up by the battery for these two amps. Do I just add them up? I'll be running 1/0 from the battery to my truing to a fused distribution block. What size fuses do I need here(an 80 for the P400 and a 120A for the Nine.1?)? I was going to get the Knu Knoceptz 2 Amp wiring kit, unless there is a better deal out there.

Also can someone recommend a god battery terminal that will make it easier to attach these wires?

Thanks for the help.

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[fasfocus00 5,000+ posts]

you fuse according to your wires rating, you said your getting Knu's amp kit their 0 gauge Fleks wire is rated for 300A and there KCA is rated for 250A, their 4 gauge Fleks is rated for 100A. all these rating are for a 20' length so shorter lengths will yield a slightly higher rating.

 

[vaa]

So the Nine.1 has it's own fuses. They are more than the 100A of the 4awg wire. Is that ok? Also the Rockford doesn't have any on board fuses so should I make that one an 80A like the manual recommends?

Is the knu Battery terminal a good one?