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Question Ever seen one of these? Under the hood of my 1994 Dodge B350 210. I have a short associated with this plug, however I have no idea what it is for?

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Did you ever figure out what it is for? I have the same thing in mine. It's not hooked up to anything. Just hanging.
 
Port for code reader?
 
That is A socket for a relay! What it's for???
 

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