This is a Garmin GPS for an automobile. The DC power supply for a cigarette lighter has been used by Garmin on quite a few models in recent years and is still in use. Ours has the nasty habit of coming apart so that the fuse and the center pin come out with the retaining nut. These small parts scatter throughout the car, and render the GPS useless, unless you want to see how long it will run on the AA batteries in the unit.
It gets worse. The retaining nut can be seen hooked over a piece of paper. The threaded portion of the nut cracked and separated from the rest of the nut. Before long the fuse will not stay in place, no matter what.
Step 1: The insides
I had forgotten, but this power converter had come apart once before and I had kept it together with a piece of plastic electrical tape.