The rubber connector fits into the hole like a grommet would. Grab both sides of the connector and pull it apart. I think you should be able to reach under the fender and inside at the same time if I remember correctly. If the wall connector comes out of the hole it should fit right back in. Dave
The grommet has a circumferential groove that sits in the hole of the inner fender. With the headlight plug removed just use your thumbs and roll that front edge inward to release plug groove from fender and push back. Rubber could be all hard and maybe low heat fro hair dryer might help.