had top motor mount replaced yesterday by my mechanic

Today, I decided to clean out my flame trap and as I started to remove the cleaner the Black wire on the side was attached to the cleaner but the other end wasn't attached to anything. Maybe came loose who knows. Forgive me if its a dumb question but where does it connect too. It seems like a vacuum wire.

If you can be specific it would help. I looked and could not locate where.

Thanks

 

It should go under the front of the box close to the motor. There is a valve where the fresh air comes into the box.