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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7909821" data-attributes="member: 576029">isolators aren't a bad idea - when they isolate the battery when the car is off.  that prevents the two from draining each other, but puts strain when they are eventually connected.  ideally, you'd have an isolator and two voltage gauges at the dash. you'd verify they were close in resting voltage before you start and have a switch to prevent parallel if you had an issue.  that's how i would do it anyway.you need the alternator to charge both.  so they have to be connected when the car is running.you don't want the diode based isolators because they introduce a voltage drop and waste heat.  the relay style of isolator is fine if properly installed.and yes, fusing on every wire leaving the positive terminal of a battery.</blockquote>

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