So here is the back story. I recently purchased a 95 C4 that had been sitting neglected for a few years in a basement with relatively low miles on it (40k) that needed some work. After getting the major issue of the 4L60 transmission fixed & shifting again, I drove the car for a few days with no issues and found the exterior lighting to be quite "lacking" to put it plainly. I decided to install new bulbs in hopes of rectifing some of the night time sight difficulties.

I was in the process of changing out the fog light bulbs & went to test them out before I closed the access doors I turned on the switch, the lights lit up for less than a second & then went out along with darn near everything else. My gauge cluster is now dead, except for the "Check Gauges" stays on. The climate control center won't respond to any command, even though the blower motor stays running. The stereo will not come on either or respond either. When I remove the key from the ignition cylinder a "clicking" sound comes from the passenger side of the dash. The interior light no longer work, basically the entire car seems "dead". Now if I disconnect the battery for & then reconnect it after some time, all electrical systems will seem to work fine (interior lights, door dinger, hazard lights, door locks, etc.) for approx. a minute, or shorter if I put the key in the ignition and turn it to the "On" position.

I am dumbfounded by what could be causing this widespread issue. I have checked every single of the maxi fuses under the hood as well as all of the mini fuses located in the fuse panel by the passengers door. All are in good condition, I even went as far as to do a continuity test on each fuse, just in case it was broken that I couldn't see.
Any advice or ideas as to what could be causing me such widespread issues would be greatly appreciated.

PROBLEM SOLVED

So one of my newer neighbors came over when he saw me in the driveway with the hood up & asked what I was working on. I gave him a rundown & he told he would be right back, he came back with both book 1 & 2 of the Dealer Service Manuals. We dug through the wiring diagrams & grounding points diagram & found that the ground wires for the fog light circuit on the drivers side was not completely tightened down all the way, & the one on the passenger side was bad (no continuity). I found the break on the passenger side ground & spliced in a new ground wire cleaned the location & tightened it down as well as cleaning & tightening down the drivers side ground. Reconnected the battery, put the key in the ignition she started right up with no issues.

The only thing that I could come up with was that since the fog light system is on the Courtesy fuse that maybe those systems may have been back feeding through the rest of the wiring harness searching for a suitable ground & just completely confused the car. No clue as to what else would cause such a widespread issue.

On top of that my neighbor told me to keep the manuals since he had sold his 95 a few years back and had no plans of purchasing another.
Thanks everyone for your help & suggestions, & to great neighbors. I'll have to make sure I bring him home some local beer from Wisconsin after my vacation next week.