Big 3 upgrade question
As for the fuse it really depends on what size wire your using. Your main fuse is to protect your wire, you should fuse each amp individually with their recommended size 50 amp 80 amp whatever each is rated at.
A second battery is not such a bad idea either
If you scroll to the bottom of the page youll see what im talking about its for the alternator to protect it from voltage runaway not for the amp . The amp wiring is something totally different and that will be a 100A fuse.
check out knukonceptz.com they have ofc 0 gauge in LOTS of color starting at $4 a ft. Cca stuff is half that price too






