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Battery issue

kevinmcp
kevinmcp Member Posts: 10
i have a 2008 fundeck. I have two batteries and leave it set on #1. #2 is strictly a backup. When I connect #2 the whole boat goes dead and won't start. If I disconnect it boat starts right up. Even if dial is still on #1 it happens. I've checked the connections and all fuses and no issues.  Battery is new and registers 12 volts. Any ideas?