Well, I got home today and broke out the electric meter..... I could get a current through the lamp prongs, so the headlamp's ok.... tried my blinkers, they work...hhmm,puzzling ... tried my horn...ah-ha ! horn's dead too !
ok, so I find the wires that are common to the horn and the headlamp, trace them back, trying to cram my big fingers into the small space where they stuff all the wiring... and tested each plastic connector in there...ha, one plastic connector that has 4 prongs seemed pretty loose...I reconnected it and, voila !, my headlamp and horn started working again......gee, wonder why I couldn't fix that on the shoulder of the road this morning at 5:00am in the complete darkness ?
Guess them engine vibrations tend to loosen things up after awhile, huh ?