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Message: <blockquote data-quote="wew lad" data-source="post: 8534528" data-attributes="member: 665412">The isolator will isolate whichever circuit you put on the output pole, if your vehicle is wired so most of your electronics are on the primary battery and not the auxilary, then you will need to rewire them accordingly or accept that when you turn the key on the circuit will equalize for a moment before both batteries are at the same level again. your car will very likely start every time unless you really kill the other battery.some switches allow you to pick between battery 1, 2, or both but its not gonna be a small switch unless you're talking about small loads less than 10-20athe reason why dealers are telling you that is because all of your primary wiring for the equipment you just mentioned is integrated in the factory harness wrapped up neatly all the way to the main battery or fuse box</blockquote>

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