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So I'm trying to do the big 3 upgrade on my son's Cadallic. So the issue is the main battery is under the back seat and I have the 2nd battery in the trunk. I wanted to know what it the best way to wire it up and should I run a battery isolator between the two batteries or not?? I included I quick diagram. Thanks for you input.
 

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If both batteries are AMG which they are, I have never used isolator and never had an issue. Just make sure you plug in positive to positive and negative to ground.

Also it wouldn't be a bad idea to have a fuse in between as well.

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