There are 2 - 15 amp headlight fuses... fuse 24 and fuse 26... one for left and one for the right side.. I would suggest removing those fuses and see what happens. They are the power sourse for right and left headlights and if you are getting some strange feedback power source, removing the 2 fuses should not interrupt the lights. Do this with all switches turned off and crazy headlights on
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Let us know what happens and we can go from there.
Keith