Join Date: Nov 2001
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Re: dual batterys
More cold cranking amps is usually free. Just clean up the engine ground, connection to the starter and the battery terminals. Use star washers on all the bolt connections. I can't imagine why you'd need more CCA than a good battery can provide where you live.
That link is for an isolated second battery. Usually this is for running high draw accessories, winch or something, off the second battery and still having the main to start the engine.