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Message: <blockquote data-quote="Kangaroux" data-source="post: 7871467" data-attributes="member: 628495"><p>There is always current exchange going on between them but when you have an isolator that current exchange begins immediately when you turn the key. Their purpose is so if your rear batt is drained completely you can still start your car. However the side effect of this is that now you shorten both of your battery's lifespans by connecting a dead battery and a charged battery. Not to mention the alternator already has to charge up the front batt from the ignition as it is.</p></blockquote><p></p>

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