I'm chiming in with some info from my Clymer (oh-0) 1966 Shovel manual.
Quote; After any charging system wiriing or component has been disconnected, the generator must be polorized before starting the engine. Failure to polarize the gen. may result in burned or stuck voltage regulator contacts and possible damage to the wiring and the gen. windings.
Note; make sure the batt. is in good condition before performing the following procedure.
After all wiring is connected (do not start engine) Momentarily connect a heavy jumper wire between BAT. and GEN. terminals on the regulator.
That's all there is about it in the book. I have no idea what to do if the engine has been started without the polarizing done. Hoople or Ultra will probably know. I have forgotten everything I ever knew about electricity because it's .... well.... electricity. Magic in it's highest form in my mind.
If I can look anything else up, let me know.