Trunk light

Okay guys, how about this. Jawbone and I were just talking, he's a retired electrician. The electrical gods are saying that it is grounding somewhere, we argued back and forth. All of a sudden it hit me, could the spring be touching a wire and the socket casing. Jawbone says, I think that you just figured it out. Not going to take it apart and try to correct it. It works with the isolator that I made.
Thank you guys, you have forgotten more than I will ever know about electricity!