All I'm really saying here is be SURE of what your doing. Its been a while since I tore into this '83 of mine, and I do remember that the wiring colors, and other things were slightly different from the "since '84" printed diagrams, otherwise, they ARE awful close, and could still be used.

As far as tightening the female spade connectors to the male counterparts, I always used either a needle nose plier, or used one of my electrical connector crimpers for doing such with. The sockets and pins, I've used small jewler screwdrivers to collapse the sockets with (they are a split type socket), or any thin suitable tool to do such with. Clean the inside of sockets with a toothpick with a peice of very fine sandpaper glued/attached to it, or any other method you feel good with, IF you notice corrosion or nasties on these pins/sockets. I had a can of electrical contact cleaner and my air blower very handy whilst doing this also. I also believe in using dielectric grease on these to slow down any repeat corrosion. Have fun. Hugh brought up a good point on the flapper valve inside the heater box also. Check it for condition, if your gonna do the core replacement/hoses (I did have to replace the valve/divertor assy. in mine). Open/closed cell insulation available at just about any home improvement stores, will aid in replacement of those pesky little air and rattling parts seals. Do a search on heater core replacement. I'm sure theres more info there than one ever wants to see or know. I know I've put my .002 in there in the past.

The connector that you are holding in front of the A/C system needs to be plugged in to the bottom of the black box labeled Nippondenso.

wow, what a mess of stuff you took outta there, i wish i could do the same i have a bunch of wires hangin all over the place, alarms stereo stuff, from POs; but i'm sorta with techno-duck, the thing is running so why mess with it, i hope yours comes out of this ok let us know.