If you want to remove main bulk head wirring harness.
One 10mm or 3/8 bolt in the center of the conector, that is on the engine bay side.
Two screws on the drivers side compartment side,
Also two locking tabs.
Should let you separate it with a good grasp or with a couple small prying tool being careful.
A bunch of nasty sticky grease inside. Good luck.
You have tried a continuity from inside to outside first i presume?
Three PINs of the conector have current , conector looks ok , no corrosion .
Fusebox - no corrosion , like new !
With the key on Pos. ON i have no current on the three terminals in the fusebox , shown in the fusebox thread here .
When i checked the conector for the first time and then plugged it back on his place , the ignition worked normal !!
Great joy . Then tried again after a short time , everything dead again .