Perko
Perko makes several master switches, about $40-$50 at West Marine. Big orange rotating switch usually located under a seat or in a compartment near the batteries. Most of your electrical stuff probably goes through the ignition switch. With no bilge pumps, its very possible your manufacturer uses the ignition as the master switch. If you or a previous owner added electrical accessories, that may have been by-passed. Again 98% it's just an old tired battery
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