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What I would do is remove the rotary switch from the control panel, and, using an ohmmeter/ continuity tester, write down which terminals connect and disconnect in all the switch positions, and then compare that to the connection diagram in the Marathon tech sheet.
I cannot answer your immediate question, but I would not assume the wire numeric designations from the 1960's MEP are the same as the newer Marathon alternator. I would compare the schematic of the switch with the required connections from the SECM alternator, which are in the tech data sheets...
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