65 Dart Instrument Voltage Regulator Tips

The ammeter circuit is problematic. The potential problems, are, the fuse link, the wire terminals going through the bulkhead connector, the connections at the ammeter, AND IN RARE cases, the "welded splice." This is a factory welded splice a few inches from the ammeter, in the black ammeter wire. This branches power off to the headlight switch, the fuse panel "hot" buss, and the feed to the ignition switch, maybe one or two other branches depending on year. Since you have the cluster out, it might be wise to inspect it.