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Dear Friends: On Tuesday, I flew my 1966 M20C Mark 21 from Fort Leonard Wood, MO to Louisville, KY (actually Jeffersonville, IN because I couldn't get into Louisville VFR despite extraordinary assistance from the Louisville Approach controller, but that's another story...). Anyway, I used both radios (King KX 170B and KX 175B TSO) on the way out and most of the way back, but after the final handoff for continued flight following to my home airport, I couldn't contact Center on either radio, but I continued to receive just fine on both radios. Perhaps unrelated, after sunset, I turned on the twin cabin ceiling red lens spotlights which illuminate the instrument panel, and when I rotated the on/off rheostat knob to the full stop brightest setting, both spotlights flashed off simultaneously. Subsequently, the single white light cabin ceiling light failed to illuminate when I tried turning it on. It worked fine the last time I used it a few weeks ago. None of the circuit breakers popped. The filament in the single, panel-mounted fuse appears fine. I found three (there may be more) wire-in-line fuses under the instrument panel. Each appears to have a spare fuse taped to a wire adjacent to the fuse in use that it is apparently intended to replace. I need to return my daughter to Jeffersonville, IN (her car is parked there because of my diversion from Louisville to Jeffersonville) on Tuesday, and really would like to have a least one operational radio for such a long VFR flight. The cabin lights are less critical and time sensitive. What's the most likely reason for both radios to stop transmitting simultaneously, yet continue receiving just fine? Are the cabin ceiling spotlights and the cabin ceiling dome light on a shared electrical circuit with a fuse located under the instrument panel? Thank you, Bobby (573) 337-3447 Sent from my iPad