this plug goes to one of those aluminum boxes. This box is attached to the inside of the driver's lower dash panel, so it gets unplugged when i have to remove the panel. I've had my lower dash panel down for a while and it doesn't seem to affect anything at all, that's why I wonder what the heck this plug is and the aluminum box that it plugs into. I've been wondering this for years.
Thanks

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'82 240D 224K miles manual transmission
mods: wooden 4by4 bumper, EGR delete and older EX manifold without EGR port, glass pack muffler (cheapest replacement muffler), rebuilt bosch injectors with Monark nozzles

working on: aux electric fuel pump, coolant/fuel heat exchanger/filter head, afterglow, low oil pressure buzzer/LED