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Hunter 34
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You have an outboard engine? I don't know if they can charge more then one battery. Yes, we need photos to see this mess.. I posted the whole project I've been doing on my boat. with a New Blue Seas battery switch that keeps the 2 banks isolated and I now have a blue seas Automatic charging relay that really is slick in operation!
Sounds like because you're using words like fat red, and black instead of positive and negative you may be confused. 2 -12 volt batteries need to in parallel. meaning the 2 negatives are black and both go to engine block, and house panel negative.

OH, and a warning! Many battery switches have a terminal marked "common" It's not common as in 120 volt where the white is common to neutral/ground It means common to both hot inputs "hot"

DON'T TAKE A BATTERY SWITCH COMMON TO NEGATIVE/GROUND IT WOULD BE A BAD DAY!

Does this help give you the mental picture?
 
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