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I've tried to clean up the original wiring a bit (not done yet). The box on the right (green) in the below image is all the items that should be supplied from the house battery (lights, GPS, music and so on). The box on the left (blue) is everything related to the motor (electric diesel pump and instruments). Right now the "+" to both boxes comes from the generator. It was this way before I started messing about. Isn't that odd? Wouldn't a "+" directly from the battery be a more reliable option?
As I would like to add another battery and "separate" the two using a separating relay am I correct in thinking that I need to add a new "+" and connect this one directly to the box on the right (green)? What about ground (-)? Do I need to add a new ground (-) cable?
There is no "main fuse" in the system would adding one be a good choice?
![Image](https://lh6.googleusercontent.com/-8pQZ4eoEncw/U4yi3ikPKQI/AAAAAAAAHM8/aoOjEmTXHs0/w816-h612-no/IMG_20140531_125215_edit.jpg)
http://www.biltema.dk/BiltemaDocuments/ ... 30_man.pdf