I do not think wiring diagrams were around then... the wiring is fairly simple and continuity tester should be a big help to determine what goes to where.
Here's the '64, but the main difference IIRC is that in '63 you had two sets of wires - one for the 12V DC one for the 115V AC.
'64 was the first year for the "univolt" and the wiring was different.
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