That suppressor was connected to the Voltage regulator.
The six-pin connector could be for a two-stage rear window defog relay ...
Strangely, none of the EMI/RFI noise suppression bits were ever shown on the factory schematics. I presume they varied somewhat from country to country, so the overburdened newhires [engineers] handling maintenance of the electrical system and documentation just never could quite get around to all of the needed projects! The parts did manage to make it into the parts catalogs, though!
This is a later schematic, but the two-stage defrost relay is the same, complete with internal error in the schematic! Easier to just put a transistor symbol inside the box ... than to get the drawing right, for some of those newhires, anyway.
