You will have to learn basic wiring whether you buy, replace or rebuild.
I am told Hayes Manuals have the best diagrams.
What looks like spagetti now is repairable if you study it long and hard enough ... one circuit at at time. Just start.
Take the manuals to bed, to the pot, doctor's waiting room ... read, study, and trace those wires. Try to understand which are hot, which are switched and if they switch on the current to go to something or if the switch is to ground to activate an already hot circuit.
There are good used harnesses out there ... I just sold a very good one from a '80 CJ for $50.00
Actually, all a harness is is a fuse box with a lot of wires coming out of it... same thing you have.
Once you begin to understand the circuitry you simply replace the bad wires and eleminate the old add-on or unwanted ones.
It's just one of those Jeep things ... and another skill to master ...
Here's mine afer a rewire ...
It took study and time but believe it or not, I learned and know every circuit!
P.S. I just remembered that I still have a '77 CJ-7 dash with all the wiring still conneted to all the switches and lamps ... so e-mail me if you need some detailed pics of what it is supposed to look like back there.[img]images/icons/smile.gif[/img]