Total loss of electrical power.

[roymil]

I'm quite sure the 4 wires on the #5 fuse lead to various loads that do not draw more current than the rated capacity, so shouldn't be a concern.   You mentioned measuring 12.7 volts incoming to the fuse bank but didnt say how far this voltage drops while you are trying to crank the engine.  I think the amount of voltage drop while loaded by the cranking starter will be an important clue to the root cause of the issues you are seeing.

[rwmastel]

A list of what's working and what isn't would be really helpful

Yes, this.

[Pawel66]

backside of the fuse box, the #5 fuse has 4 wires attached to the output side. Isn't that little too much?

It is, actually 5 wires coming out of fuse 5. You have the wiring diagram, right?

More detailed description of what works what not would be helpful.

[CJHenderson]

No Lights, No Hazard lights & side lights, no ignition buzzer, no starter. All in all, no instruments and no ignition. Other things like radio, speakers, heating, have been installed.

[Pawel66]

If there is no door open light and clock is not working - I would be looking in fuse box wiring or main ground, given the information on the voltage you provided.

Is the main ground wire properly screwed to wheel arch? I understand you have no cut off switch anywhere. Are the battery terminals properly fixed?

No other ideas...

[rwmastel]

When I had problems with power in my Wrangler, the negative battery cable was loose in the post clamp thing.  Clamp was tight on post, but cable still loose in clamp.

[Pawel66]

I had a lead clamp I overtightened that broke. You could barely see it was broken, but the contact was poor, the car died on the road.

[CJHenderson]

Replaced both negative battery and main grounding cables. Have good lights and engine cranks over great. Now to replace one item at a time and check. Thanks to everyone on this thread for your patience and Pagoda knowledge, I definitely would be up the preverbal creek without a padel.