I am currently in the process of preparing to remove my engine to rebuild it. Right now I am labeling all the wires so I know where they go when I reinstall the engine. There was just one cable that I do now know where it goes to. It appeared to be a 3 prong socket with a cover. It is located behind the fan shroud, branching off from the wiring harness. My bug is a 1978 Superbeetle convertible with fuel injection. 

this is about the only way I can share the pictures I’ve taken of it 
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That’s the VW dealer diagnosis connection so the tech connect to the vehicle. Useless now.
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