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<blockquote data-quote="tommyk90" data-source="post: 1360829" data-attributes="member: 545293">Thats only when you have the car OFF i believe.The isolator has a relay that has to be wired up to your ignition wire.&nbsp; When you turn the car on, the relay turns the isolator &quot;off&quot; essentially, letting the rear battery charge off the alternator.Turn your car off and the isolator opens up and separates the rear battery from the front one.But, if you run a dual battery setup, the rear battery has to be grounded as well (whether to the chassis or another run of 1/0 to the front battery).&nbsp; You can&#039;t just run the positive wire from the front to the rear battery, and attach the AMP&#039;s ground to the rear batteries negative terminal.The rear battery has to be grounded to the whole system.&nbsp; IIRC&nbsp; The rear battery isn&#039;t going to charge if it doesn&#039;t have a ground to the chassis or front battery.</blockquote>

[QUOTE="tommyk90, post: 1360829, member: 545293"] Thats only when you have the car OFF i believe. The isolator has a relay that has to be wired up to your ignition wire. When you turn the car on, the relay turns the isolator "off" essentially, letting the rear battery charge off the alternator. Turn your car off and the isolator opens up and separates the rear battery from the front one. But, if you run a dual battery setup, the rear battery has to be grounded as well (whether to the chassis or another run of 1/0 to the front battery). You can't just run the positive wire from the front to the rear battery, and attach the AMP's ground to the rear batteries negative terminal. The rear battery has to be grounded to the whole system. IIRC The rear battery isn't going to charge if it doesn't have a ground to the chassis or front battery. [/QUOTE]

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