electrical gremlins
Start by reading that article in the link in post 3. At the least you need to clean/ rebuild your bulkhead connector. You can buy those terminals, they are called "packard 56". There are different types, and you must find the kind where the edges are curled around like this below
These kind below---with the tab folded over the top will NOT fit many Mopar connectors. They will fit some of the later cars "some" connectors