fuse question

[btlking 10+ year member]

what size fuse should i run between my batteries? there will be the one under the hood and 2 in the back do i need fuses between each one or not and what size

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[Duke 10+ year member]

What size wire?

For 0 gauge, I would use a 300 amp fuse. For 4 gauge, I would do 125. I would put a fuse on the long run of wire really close to each battery. So, 2 fuses on the long run of wire from font to back. One at each end.

 

[ultimate157 5,000+ posts]

What size wire? If it's 1/0 then 250 or 300 will work fine. One fuse within 8" of each battery on the + wire.