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John Kallend
Professor Emeritus
Department of Mechanical, Materials and Aerospace Engineering
Department of Physics
IIT, Chicago

Check that you have a good connection to ground/earth from the headlight. I have had some weird symptoms when I had a poor ground connection (admittedly with incandescents and not LEDs). John Kallend - TC0845 Professor Emeritus Department of Mechanical, Materials and Aerospace Engineering Department...