Runnin 2 batteries?

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Do i need like an isolator or someshit like that? Or just positive to positive? Also negative cant I just ground it instead of runnint negative to negative?

 
Positive from front battery to rear. Ground rear battery.
Sorry my bad Im kinda drunk thats why. Visiting my uncles grave :/ i can ground my amps and battery on the same bolt right? Just need a distribution block right? How many runs do you recommend the battery is for 2000_3500 watts. Im gonna run 2700 wattsrms at most. Also do I need battery isolator or diode crap? Thanks man

 
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