My 1982 MB 300SD is running great...besides the usual issues (non functional odometer, and balky climate control)...gets 27.5 mpg continually, and is a joy to drive! My glow plugs are new and ready for a new winter. My attention this morning is a bit esoteric. I have a unidentified plug / connector against my firewall, close to the master cylinder. Obviously it is altered (see photo / see yellow taped object), but I do not know what it is supposed to look like. Most likely this is a sleeping dog that I should continue to ignore, but...

Any ideas?

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