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Message: <blockquote data-quote="buildmeabox" data-source="post: 3467714" data-attributes="member: 560799">Its ghettoy but it works, with a battery isolator you will achieve isolation between your starting battery and auxiliary battery.  When the vehicle is running the battery isolator will charge both batteries as long as there is a load.  Under heavy loads, auxilary battery for your car audio, current will go directly to your alternator output.  All your doing is using both batteries to run your car and your stereo.If you play your music with the vehicle off you will drain both batteries, longer run time,  but if you install a battery isolator only your aux. bat. will drain and your starting bat. will be fully charged.</blockquote>

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