This is not a Chevelle problem, but it could be. I have a Four Flat connecter for trailer lights on my Suburban. It is getting increasingly more difficult to make a good connection with my trailer hookup. I'm sure that the problem is corrosion in the connector. It is such a small hole, I can' get anything in there to clean it. Any suggestions???

A worn out 22 cal. gun cleaning brush?? Then some dielectric grease on the contacts.