It definitely would have been 12 volt. 140 electrical changed 4 times during production. It went from 6 volt generator, two different systems with 12 volt generator and finally 12 volt alternator. I have the wiring diagrams for all 4 systems and the serial number split when the changes occured.
If you wish give me the serial number and I can tell you exactly what you have. You are very close to models with alternator, in fact I think it happened prior to 74. I only have the figures on serial number, and have never translated those into years.
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