Audio Systems: Aux battery and isolator, high output alternator, watt amp

Question
I have a 1990 honda accord and need to hook up a second battery and isolator to my audio equipment.  I have 2- 12" subs and a 1500 watt amp.  If you could help or send a link for a diagram that would be great.  Thank you

Answer
You are better off getting a new, high capacity battery and high output alternator.   But, you can buy isolators for $50 and up.  Go to google shopping and you will find many to choose from.

http://www.google.com/products?q=battery+isolator&hl=en

Here is a nice tutorial on installing and wiring isolators.

http://www.bcae1.com/battiso.htm

Most isolators have a wiring diagram that comes with them.  The purpose is to keep the charge currents from overloading the alternator.   When one battery it charged it switches over to the other battery.  

Let me know if there is more to the story.