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Message: <blockquote data-quote="audiolife" data-source="post: 6849631" data-attributes="member: 541383">Isolators have their place there are several different types. No matter what though current is going to go to the item wanting the most power.Relays and such allow the 2 batteries to work together when connected but when they are activated they can cause a spark that can eventually damage the relay or the batteries themselves where as an actual isolator is used it has a voltage drop and the front battery will not help for the system. Sure it allows you to start the car in key off listening but if the back battery dies it may damage the alt and I have even seen it where the front battery is actually running the car while the engine is running because the pull of the audio system iis draging down the alt. (not that common I doubt but I have seen it). If you have a daily driver that you actually drive alot a parallel system is fine and if you know you are not going to be driving it for sometime (days or week) at least take out a fuse between the batteries if not just totally disconnect the batteries. Another thing people over look is they store a car they leave everything hooked up to the battery and leave a battery tender on it. Actually the best way to care for a battery in storage is to dissconnect it from the car and to then put a tender/maintaining charger on it. Just because the car is off does not mean it may not have a parasitic load.If the wattage rating of the battery exceeds the output of the alternator and the battery does not have a large capacity I would take the rating with a grain of salt. If the battery discharges so much and has a low capacity it will become dead faster and need recharged more often especially if the system has a smaller alternator than required.</blockquote>

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