Need Help Adding Extra Batteries!!

[hoodkid 10+ year member]

I plan on adding 2 batteries in the back, but I am kinda of confised, If i ground them to the chassis in the trunk do i just ground the amp to the negitive posts?

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[btlking 10+ year member]

you can yes or you can ground them batteries back to the battery under the hood

 

[hoodkid 10+ year member]

put i hook the pos & negtives to each other on the batteries and then ground the last one to the chassis then ground the amps to the negitive post

 

[btlking 10+ year member]

if you want you can still ground the amps to the frame though

 

[hoodkid 10+ year member]

thats what im doing