The fusible link should have failed first. It is between the starter relay to the bulkhead. Often they kill the plastic at the bulkhead connector when they fail. Evans wiring sells just the plastic if you want to keep it original and fix the harness without a whole new one.
Likely the wires came loose at the ammeter or the bulkhead connector. #1 issue with our Mopars. If you're good at fabricating and have access to a wide selection of wire, Packard connectors, pro-quality crimpers, you could make your own harness. Or go aftermarket like American Autowire or Painless. Evans have most everything except the dash harness. I'd recommend a new engine harness. I replaced mine on my Charger (along with a new Packard connector at the inside bulkhead for the fusible link feed) and it cured my charging issues.
Sign up for Year One's emails. They'll have a 20% off sale, your down to 580.- Looks like there is an early and late 72 harness. Maybe someone else on here will know the difference.
