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Did not know that Tom.
I have never heard or seen a dual filament headlight bulb, which has a headlight and park light filament side by side.
I thought the bright and dim on the wiring diagram meant high and low beam.
If, which is it probably is not, hole is for an old OZ law, one would think a separate or modified circuit would have to be installed, to just turn on tail light on its own.
Otherwise, the feed would travel back thru wiring and light headlights and the battery would not last long.
No diodes in 1928.