Quote:
Originally Posted by Jon D
OK, the master, as you correctly say, is split - one half controls the battery circuit, the other controls the alternator circuit, but do you know why? Not something I'm previously familiar with, even on dual-bus systems, so I apologise for my lack of knowledge on the Piper.
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I haven't read up on the reasoning behind the split switch but I'm guessing it is so that if you have an alternator regulator failure which means it keeps charging the battery, you can then isolate the alternator and continue on the battery. There may be some other failure mode where the battery is discharging despite the alternator going and in that case you want to isolate the battery until you need it.