What is this plug for?

What is this plug for? It’s in the trunk.
 

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It looks more like a PC mother board connector than an automotive connector. Where does the wiring harness go? Is it stock?

If it's stock then my vote is a stereo system.
 
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Whatever it is, it's not a factory Ford connector. A couple possibilities come to mind but are not limited to:

Half of a disconnecting trailer harness
A plug installed to run an after market stereo amp through the factory wiring
 
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