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Hope this helps. I drew it quick. Use minimum 10 gage wire for charging, and battery cable for the battery switch and starter. If you use a 2 bank charger it will have 2 terminals for 2 batteries. You will have to pick up an isolater for the charging wire from the alternator to isolate the 2 batteries. It will keep 1 from getting overcharged and also 1 from getting drained. There is instructions on the package. All items available from any boat supply store.
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