The pictures are helpful but I still wonder if there is a locking tab. The curved rectangular piece on the top looks like it might release.

I only see one wire. Is there a black one in the shadows? There are two tabs and I doubt there is a body ground in this location so there must be another wire.

I thought mine was cured with a new fuse but I think it truly is broken. I changed the fuse but it burnt out shortly after. I think the remaining metal tube creates a high resistance at the contact surface. So waiting for an eBay purchase with a lighted ring surround.