Burned bulk head connection
First thing to do is read the MAD article. Even if you don't perform that mod, that article has a good simplified diagram of the current path and explains the "why" of the problem
Catalog
If you don't have a service manual go to MyMopar
MyMopar - Mopar Forums & Information - MyMopar Tools/Reference
Wander around in there, there is lots of great info, as well as free factory service manuals (which contain factory electrical diagrams) as well as aftermarket diagrams under "wiring" which are sometimes easier to follow but may not be completely detailed
You can buy the connector terminals for those connector shells they are known generally as "Packard 56". You must be careful to get the correct ones.