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I recently bought a Bluesea PN5018 6 circuit fuse block to help with the rewiring of my 1987 15' SS Whaler. The fuse block does not have a neg bus. It has a "stud" where i see i can attach the positive wire from the battery. My question is, where do i attach the negative wire from the battery to the fuse block.

I am also replacing the 12volt "cigarette ligther"type power socket, do i wire it directly to the battery or can i attach it to the fuse block, if the fuse block, what size fuse do i use