I completely rewired my batteries on the 390 years ago. I got rid of the stock 4-battery box and built a new one out of 3/4" marine plywood and installed the following batteries.
1 - 12V. cranking battery dedicated for starting both engines
1 - 12 V. cranking battery dedicated for the windlass & generator
4 - 6V. 245 A/H golf cart batteries wired series/parallel for everything else (no problems with 4-day long weekends even without the genny)

I religiously checked the water levels in these batteries 3 times per season & after 8 years they are still going strong.
 
Checkout the Solar BA7 Battery Tester on Amazon.
Inexpensive and suits the needs of most average guys.
 
O.K. Guys, Thanks for all the input! Problem solved, and so far, so good. I did replace the Battery Charger with a Promariner Pronautic 12.30p smart charger. Then replaced all of the batteries with four Duracell Ultra Platinum Deep Cycle/Dual Purpose AGM Type 31M Marine batteries. The Sea Ray configuration for the 2004 320 was: Port battery bank for Port Engine and House Load, and Starboard battery bank for Starboard Engine, Generator and Helm Electronics. With the new batteries and charger, everything starts right up and purrs! NOW I'm ready to do some cruising!!

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That's fantastic.

I know it sucks to spend a few boat bucks $$$$ right after you just purchased your boat but you just prevented yourself from having many headaches associated with batteries and charging.

Enjoy your boat.
 

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