Fried wiring

If you have an electrical background you are already "one up." Several ways to go, buy a "repop" replacement "factory" like harness, and plug it in, or pull the old one out and attempt to fix it, or go find an good condition used one, in this day and age might be difficult

Or go aftermarket. There are many different harnesses "universal," and if you don't have much extra, like pumps, fans, EFI, etc, even a generic "12 circuit" can be made to work

You can download free shop manuals from MyMopar