I'm thinking you have a bad current path from that one particular battery. It could be anything from the battery post to the starter solenoid, every cable, terminal, connection on either the positive or negative side. Maybe even the battery switch itself. It's possible there are multiple issues too so even if you find one problem, don't stop there and call it good. Be thorough.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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