GCR 17.27: "The master switch shall be installed directly in either battery cable and shall cut all electrical circuits..." (my emphasis) I was describing above with this requirement as an assumption.
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Good point, okay, now we're done. What that also means is that the other thread from this forum that I referred to earlier was giving bad advice, as it recommended connecting the alternator directly to the battery.

So thanks. Sorry that it took us so long to get there.