Unfortunately your question (?) is unclear, and has insufficient information to answer it.
What is the specific situation the problem occurs in (or does it happen in all situations even just sitting there), and what are the complete details of the problem?
Did the problem always exist, or did it work at one time and stop working?
If the latter, what happened between the time it worked, and the time it did not?
What other parts are connected to it, and what vehicle is it, what terrain and riding conditions are you using it with?
More information is almost always better. Less information almost always means we can't help