Cigarette lighter trouble

 
Ford Focus zx4 se


I replaced fuse-#47 -15A and it blew right away. Then
cleared a short circuit in the lighter socket and inserted
another fuse. It held but later when I truned the engine
off it would not start again. I removed the fuse and
jumpered the battery. All is fine now.
But without the 12V outlet for my GPS

What amiss?
Could someone help?
 

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