I was checking my radio antenae on an unrelated problem and found a strange plastic "container" just forward of the antenea behind the panel. It appears to be ~4" on the side with a 3 pin connector on the top and a 6" cable that goes to another connector. This cable is unplugged from what appears to be the mating piece.

It appears that no one has ever been in here before or they were awfully good as nothing appears disturbed except this strange box with the unhooked plug.

Who knows what this is?

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Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)