hooking up an extra battery

i would say no you dont have to fuse it as long as its under 18 inches...however id wait for haemphyst to comment however I believe that you should first answer his repeated questions about the batteries...

haemphyst wrote: Again, ar you going to replace both batteries with identical batteries at the same time? You keep showing different batteries in your diagrams...

This in itself is going to make or break that setup really really fast so first off before you ask any more questions please post an answer to that question so they know that you understood its importance.

1: thanks, twobig... seems as though I am being a little bit ignored... 2: twobig is right, if you go TOO much over 24 inches, just for safety's sake, I'd fuse it... There are distribution blocks that bolt directly to the battery terminal, as well, and I have seen them with fuse protection built in. If you can find one of those, you'll be GOLDEN!It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Yes i will be having 2 of the same batteries. Not optimas though its this brand they sell at batteries plus. There 200 dollars and more powerful they optima d31. So i do NOT have to fuse the short run of 1/0 gauge coming off the battery into the fused distro?

And this diagram will be an appriate safe way to wire and fuse what needs to be fused?