Look up the wiring for a series/parallel switch used on big rigs (trucks). 12 volts to run all the trucks accessories except the starter, which is 24 volt and activated by a solenoid that changes two banks paralleled to series (and it doesn't mess up the rest of the system)
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.