how to connect 2 batteries together?

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Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=66108
Printed Date: July 15, 2025 at 12:46 PM

Topic: how to connect 2 batteries together?

Posted By: Sigfried
Subject: how to connect 2 batteries together?
Date Posted: November 12, 2005 at 9:53 AM

Hi guys, I have a question, how to connect two batteries together? i need to put two batteries, but i want to know how must it be done, thnx guy.

Replies:

Posted By: DYohn
Date Posted: November 12, 2005 at 10:31 AM

Connect them together in parallel using cable sufficient to carry the entire load (usually 4AWG or larger.) Ensure your alternator has enough capacity to charge them both and still supply your entire vehicle's load.

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Posted By: j_darling2007
Date Posted: November 13, 2005 at 12:49 AM

And also, if one battery is newr/different than the other, you will need to run an isolater between them.

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