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Message: <blockquote data-quote="helotaxi" data-source="post: 1584325" data-attributes="member: 550915"><p>The isolator as mentioned earlier is two diodes, one for each battery.  A cable runs from the alt to the isolator and then each battery has its own diode and output pole.  Think ofa diode as a oneway check valve.  Current can only flow one way through it.  That one way is from the alt to the battery.  Current can't flow from the batteries to the alt or from battery to battery.  You connect audio system at the second battery.  The starting battery is completely isolated from the audio system and the batteries dont mess with each other.</p></blockquote><p></p>

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