unplug it and take it off the post.Sand the part that touches the post and put it back on then plug it in.I relocated mine and it did the same thing.Vibration will make it work.Just need a better ground.This is from 2006. The problem is in the morning, this do not sound. I haved to accelerated and the horn works. If I accelerated this works and after some minutes, this start to work fine, until I turn off the motorcyce. Any suggestion.