A Delco series SI with a three-wire hookup has the main big output terminal,and the two small plug-in terminals #1 and #2. #1 must get power only when the ignition is "on." If it it left hot all the time it will draw down your battery. #2 can be hot all the time.
The main output terminal is also "hot" all the time and has isolation diodes built into it so it cannot drain your battery. If those diodes leak, it will cause a drain.
the backfeed issue you mention has nothing to do with the drain issue you mention. Backfeed is usually stopped by using a diode or an automotive type ignition switch with separate IGN and ACC terminals. If you use the latter, no diode is needed to stop ignition backfeed.
The alternator does have residual magnetism and can excite by itself with no added field current, but it has to spin so fast to do it, #1 terminal is used to send exciter current to create an electric magnet inside the alternator. This way it can start to charge at 1600 RPM instead of 4000 RPM.
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