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Discussion Starter · #1 ·
I already have my 4 guage wire for my amp from the battery to the trunk. I can use that for my second battery but wouldn't that make it become 24 volt? Will that hurt my electrical system? Is it as simple as positive to positive and ground the negative or is there more to it?
 

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you can get a battery isolator at Auto Zone or Advanced Auto parts. I forgot I installed one when I did my second battery.
 
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