[muzesick]

Your problem is the gear inside the motor housing. The teeth on the gear are breaking, but in time your lights will not function. Once you replace the gear and seal it the problem will go away. You may purchase the gear from NAPA ($20) or you may purchase an aluminum or brass gear from an ebay dealer ($40-$60) with everything you need to complete the job. The cover must be sealed tight ,if not the cover will come off. Good luck!!