Hi, i had a problem with headlight with my duke 390. Low and high beam not working. I disassembly and clean the light switch and all of the cables. I clean all ground wires but nothing. Finally and after much search and work the problem was in the headlight control unit. I replaced it and my headlight works perfectly. I write here my problem if i can help anybody with same problem.
Alexmitris
Good job. It might help more if you were to mention which headlight you have since there are several different ones.
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