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Message: <blockquote data-quote="martiandancer31" data-source="post: 7562820" data-attributes="member: 616516">when the vehicle is on, the isolator should allow current to flow from your charging system into your secondary battery. In this case, your alternator is charging both of your batteries up to, say, 13.8-14.4 v, and they are not fighting each other.However, when you turn the vehicle off, your kinetic will probably want to rest at a higher voltage than your stock batt, and in that case they would "fight" each other and in all likelihood the result would be decreased life for at least the kinetic. Hence why you include the isolator in your system, to remove the connection between those two batteries when the vehicle is off.</blockquote>

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