Thanks. I have a new dimmer switch on order, and when it arrives I plan to see if it fixes the problem. The old one does look pretty old. Based on a date code I saw on the old headlight switch, it appears to be a service replacement from the early 1970s (the engineering code starts with D0...). If the dimmer switch is at least that old (it sure looks it), I suppose that could be an issue.
Should the dimmer switch get warm at all? One of the things I checked yesterday was to touch the dimmer switch with the high beams on. By the time the lights started flickering, the switch was slightly warm to the touch. Not hot like the headlight switch, but noticeably warm.
Thanks,
Joe
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