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Message: <blockquote data-quote="helotaxi" data-source="post: 354298" data-attributes="member: 550915"><p>As long as the batteries are identical then you don't need an isolator.  If you are running different batteries front and rear then a charging relay is a good idea.  It allows the batteries to run in parallel when the car is running but isolates the two batteries when engine is off.  This serves three functions: 1) it allows the alt to charge both batteries when the car is running and the alt is the primary source of current.  2) It keeps the two batteries from trying to equalize when the engine is off which would lead to the premature demise of one or both batteries.  3) It keeps you from draining the starting battery when you are running the system with the car off.</p></blockquote><p></p>

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