There are connectors for the front indicators under the small plastic "dash" under the windscreen. To access them, remove the windscreen and the small plastic dash (with kawasaki on it). Try wrapping the connectors in something to avoid vibration.
A lot of people also experience buzz from the ignition lock.
Pry the "wings" (one on each side of the lock) about 1mm out so the lock will not touch, and the buzzz is gone.
Actually, I do believe the vibration in the handlebars is a lot less after the ignition fix!