Intermittent total loss of electrical

Dennis Jackson said

and a solid wire run through the port.

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Its possible the splice or terminal crimps that person made are now coming loose. Or even the nut holding the ring terminal, especially if the wire was under some strain that made it want to rotate counter clockwise. None of these high probability but all certainly possible.
Looking at how the splice was done in the engine compartment might give an idea of the quality of the work that's under the dash.

When Chrysler bypassed the multiconnector, usually the fusible link was moved to the starter relay. Sometimes a second link was added depending on how the size of the wires and whether the ammeter was also used as a distribution point. Unfortunately maybe the person who did the modification did not consider the link important.