> Installed new hi-lo switch and indeed, restored all functionality except driver lo beam, and driver front flasher when the parking light is on. The flasher works with all lights off from the dash headlight/parking light switch, same as other three flashers.

Swapping the ignition switch for a new one had zero effect other than enriching Always Veedub another $15.

Earlier, I made a passenger side common bodywork ground for headlight/turnsignal/flasher. They are all working perfectly.

Do the same combined ground on the driver side? Return to tracing circuits? Ideas?

I have SA headlights with wiring harness joining the inners to outer highbeam circuit. As I mentioned, the passenger side lo or hi, the initial problem, now work, but the driver lo and combined flasher and parking light (parking light works with other three) no longer do. The hibeam LED works as designed.