Final wiring questions, I promise.

[Lurius 10+ year member]

Ok, well I finally finished shopping for amps, speakers, subs, etc and now I am pretty sure ill be having to upgrade my wiring now.

Currently I have 4 gauge power/ground wire installed, and it was going to be all I would need I had thought, but now I ended up getting a much more powerful amp for my speakers and am pretty sure that the sub amp and this new one will require a larger gauge wire.

The first amp(powering subs) is an alpine mrv-t757(750w peak advertised, amp us underrated), fused by a 40A fuse. The amp powering speakers is a kicker 650.4 which is about 675w-700w peak(a little underrated too, though I will be turning the gain down a little for the rear speakers, if that makes a difference), fused by 2 40A fuses.

I saw a chart once for maximum amperage for different gauge wires but I couldent find it using the search tool.

What amp inline fuse would I use directly after the battery with this much draw?

Im pretty sure I need at least 2 gauge, but if I have to replace the 4 gauge im just going to go with 1/0 gauge incase I have any future upgrades.

Any other problems I may have, suggestions, ideas, etc are welcome. I am nearly complete with the purchase/plan phase and am about to get everything installed within the month, just running into one cost after another, lol.

Thanks,

Lurius

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[knukonceptz 10+ year member]

Well depending if your 4 gauge is real 4 gauge (we all know some isn't) it can handle 120A at 17ft. Which you have a 120A maximum draw. You probably will never see this peak number so in theory the 4 gauge will be fine. You would want a 120A Fuse at the battery.