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I finally had a chance to get into this issue.  I checked, wiggled, removed and re-inserted all 4 bulbs.  Checked connections inside the headlamp shell. No change.  Then I ran a jumper from the battery to the flasher and it started working properly.  While connecting the jumper I did take a look at the harness above the battery and moved it around a bit.  No visible signs of chaffing etc.  After I removed the jumper, it kept working properly so I buttoned it back up and went for a ride.  All ok.  I suspect that my moving the harness may have done something but am wondering if connecting the jumper gave it just enough boost to start it working again.  Oh well, on to the next thing - some overdue polishing.