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<blockquote data-quote="brian84corvette" data-source="post: 8296198" data-attributes="member: 586635">normal wet cell starting car batterys will generaly rest at a lower voltage than a good agm battery will want to rest at.&nbsp;&nbsp; if you directly hook them together the battery with higher voltage will always keep trying to charge the battery with a lower voltage - and in turn the better of the 2 batterys will always remain at a semi state of discharge.it is not the ideal way to hook it up - but people do it all the time - it will work - its not the verry best way to do it.&nbsp; &nbsp; ive done it in the pastthe best way to add that battery to your car right nowis to install something called a relayit can be wired to ignition hot.&nbsp; so when the key is off - the relay will &quot;un hook&quot; the agm extra battery from the front batterybut when the ignition key is on and the car is running - and alternator producing 14v&nbsp; then both batterys are hooked up together to power the car and system.the other acceptable way is to remove the regular wet cell car battery from underhood - and replace with the same type of agm battery.</blockquote>

[QUOTE="brian84corvette, post: 8296198, member: 586635"] normal wet cell starting car batterys will generaly rest at a lower voltage than a good agm battery will want to rest at. if you directly hook them together the battery with higher voltage will always keep trying to charge the battery with a lower voltage - and in turn the better of the 2 batterys will always remain at a semi state of discharge. it is not the ideal way to hook it up - but people do it all the time - it will work - its not the verry best way to do it. ive done it in the past the best way to add that battery to your car right now is to install something called a relay it can be wired to ignition hot. so when the key is off - the relay will "un hook" the agm extra battery from the front battery but when the ignition key is on and the car is running - and alternator producing 14v then both batterys are hooked up together to power the car and system. the other acceptable way is to remove the regular wet cell car battery from underhood - and replace with the same type of agm battery. [/QUOTE]

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