sorry I can’t help. I assume you have to be moving to hear it so that eliminates the alt whine. Have Honda take a look if it bothers you.
Try changing the pads despite the amount left. Could just be the old pads.Hello everyone I'm new to f6c I have 2014 honda valkyrie its my 2nd bike I have owned it from 2018 no issues until the brakes makes squeaking noise i did cleaned the calipers and break pads i still half of pads left on front didn't check the rear but both make the same squeaking noise front and rear what do you guys think???