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<blockquote data-quote="wevie" data-source="post: 5236535" data-attributes="member: 603871">I understand your logic, but it is flawed.The alternator will be connected to both your cars battery and your stereo&#039;s battery bank.&nbsp; The current will leave the alternator, pass through the diodes and into each storage unit.&nbsp; The diode in an isolator will keep the current from the rear batteries from reaching the front battery.However. . . when the rear bank calls for massive current draw from the alternator, the voltage out of the alternator will be pulled down.&nbsp; The car&#039;s battery will also see this drop in voltage.&nbsp; Lets say the alternator output starts at 14.0 volts and is pulled down to 12.7 volts.&nbsp; Both of these are higher than either battery, so both systems will see the voltage swings.&nbsp; If the alternator output is pulled down to 11.9 volts, then the car&#039;s battery will be isolated during that time and maintain its own inherent voltage (12.0??)The only way to completely isolate the batteries is with totally seperate systems sharing ONLY a ground.&nbsp; Dual alternators wired independently.</blockquote>

[QUOTE="wevie, post: 5236535, member: 603871"] I understand your logic, but it is flawed. The alternator will be connected to both your cars battery and your stereo's battery bank. The current will leave the alternator, pass through the diodes and into each storage unit. The diode in an isolator will keep the current from the rear batteries from reaching the front battery. However. . . when the rear bank calls for massive current draw from the alternator, the voltage out of the alternator will be pulled down. The car's battery will also see this drop in voltage. Lets say the alternator output starts at 14.0 volts and is pulled down to 12.7 volts. Both of these are higher than either battery, so both systems will see the voltage swings. If the alternator output is pulled down to 11.9 volts, then the car's battery will be isolated during that time and maintain its own inherent voltage (12.0??) The only way to completely isolate the batteries is with totally seperate systems sharing ONLY a ground. Dual alternators wired independently. [/QUOTE]

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