Blue Seas (bluesea.com) sells a new battery switch that when in the on position it connects the boat battery just to the boat wiring harness, and you 2nd bat to the accessories, It also has a postions to connect the two batteries. To figure the size of fuse or breaker to run on the amps divide the your watt's by 12 so 1200w use a 100amp fuse. Using too big of a fuse will not blow if thier is a problem and your amps will be damaged. To small and it will blow if your rocking out too hard. Another note, your fuse or breaker should be no more then 6" from your battery. This protects you from burning up your amp cables if you have a short.
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