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As I see it, the strobe lights are connected to the red beacon on top of the fuselage but can be switched on and off independently of the wingtip navigation lights.

The Beacon light switch controls both the Beacon Lights AND the Strobe Lights. So I can have:
(1) NAV Lights only ON (NAV Light Switch ON)
(2) Strobe and Beacon Lights only ON (Beacon Light Switch ON)
(3) NAV Lights AND the Strobe Lights AND Beacon Lights ON (NAV Light Switch ON and Beacon Light Switch ON)