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Message: <blockquote data-quote="tsupra98" data-source="post: 4845467" data-attributes="member: 597873">make sure your alt is charging the batt all the way when the car is running. it should at least be charging 13.7 volt when the car is running(thats not including with your system running).if both the batts are connected then yes it's draining both of them not just the one.  whatever the front one can't put out to start the car it'll pull it from the second one.  and if your alt isn't charging all the way when your car is running then it's really going to kill the batts</blockquote>

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