THANK you. See that's all we want, enough info to actually see what you see and have "some idea."
I have bad news. Judging from the photo, there is only one thing to do............Drop the column, pull the cluster and tear the dash apart, and strip out the entire under-dash harness. This is not as bad as it sounds. When I was young, I could do that in 2-3 hours. Nowadays, it would take me all of a day.
WHY? Because when you get meltage like that the wiring in the harness often gets internally shorted together. "Anything" can happen after that
..........and go from there. The way I see it your choices are
1.......Strip out the harness, stretch it out on a bench / plywood, and mark everything. Cut it open and tape it so it stays in place. Physically inspect for insulation damage, and replace the wiring that is affected. Repair other problems, and inspect and repair all connectors
2.......Buy yourself a replacement factory harness from "somewhere" like year one
3.......Find a good used harness and deal with that.
4......Buy an aftermarket harness like Painless........'n many others and just plain start over.
I never said it would be easy.
Be sure to read this article
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
Which is not only a great read and summary of the problems these girls face, but also explains the basic power distribution
You have a shop manual? You can download them, free, here
http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617
and here
http://www.mymopar.com/index.php?pid=31
Also, from MyMopar, are somewhat simplified, but not always complete or correct diagrams. They are sometimes easier to follow
http://www.mymopar.com/index.php?pid=24