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Message: <blockquote data-quote="Databyter" data-source="post: 6819895" data-attributes="member: 621750">If you do it you should run BOTH batteries to a battery isolator (about 20-40 bucks). The lead from your alternator goes to the isolator, and then it ONLY charges the battery that needs a charge.If you don't use an isolator then make sure that your batt.s are the same type , age, and size, and share the same load (and wiring runs if in different locations), otherwise you will be overcharging one (which is bad) and reducing the current to the other(which is bad), and making your alternator work twice as hard (which is really bad).</blockquote>

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