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help with dedicated audio battery...

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I am considering adding a third battery in the rear of the vehicle, how can I do this as I am now running 2 lead acid group 75's in the engine compartment and my single Alt has only one output?

I'd like to have this third AGM battery for the audio system only, but I am not certain how to do this correctly. Do I need to run an Isolator on the dedicated charge wire for the third battery, maybe a charging relay instead or am I way off base here? I thank you in advance for any advice.

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No need for an isolator or relay. Just hook it to one of the front batteries which ever one is convenient. This way your system can have the benefit of all 3 batteries. Make sure to put a fuse at the back battery as well as the front and you should be good. Even with different types of batteries ( lead acid and AGM) people report no problems.

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