ECCS unit; 2 connectors fit on one slot

http://zr.no/hawkon/car/wiring/eccs.JPG

As the title says, 2 connectors fit the third slot on the ECCS.. I'm pretty sure the right one is connected (ref. Haynes manual). This is for a '86 CA18ET T12 bluebird, by the way.

Anyone know what the third one is for? Or have I just misplaced the wiring?

Also, what the heck is this box supposed to do? (Located under the drivers seat. Unique connector, so I guess it should be there.)

http://zr.no/hawkon/car/wiring/hvaerdette.JPG

And a third one ;)

http://zr.no/hawkon/car/wiring/wtf.JPG

What does this do? And where should it be located, if you've seen one before.
I -think- it's a relay or a circuit for a dashboardfitted instrument, but I'm not sure... As I can't get any sparks on my plugs, I kinda need to know what everything does in order to eliminate doubts to everything that could have a connection to the ECCS...