you're not suppsoed to mix deep cycle and starting batteries in the same circut, although i see it all the time. Add a battery combiner to the circut, it allows both batteries to be charged, during a high amp discharge, it disconects, or when batter voltage gets low, it disconects. BTW, you have it conected correctly, check into the combiner,not a isolator. an isolator achives the same results, does it a little differently and is harder to wire, the combiner is easier to install
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