2000 Ford Ranger cigarette lighter blows fuse

The cigarette lighter on my truck wasn’t working good.  I got a new one, put it in, and now it blows the fuse.  What could be wrong, and how do I test it to see if it is the new lighter or the wiring is bad?

Note: I only had two wires to attach to this lighter even though there were 3 places for wires to be attached to.