67 Dart Conv. - No Tail Lights, Park Lights, Flashers
Classic damage on the L1 at the B1 terminal. After you solve the mystery, consider a relay harness for the headlights. For some reason all the A-bodies have weaker headlight wiring than their bigger breathern. It was OK with 6012 bulbs but not the newer replacements.
Sometimes the wires at the dimmer switch and at the headlights themselves get hot too. They're only 18 gage on the A-bodies. Relay harness takes most of the power off these wires and uses them simply to trigger the relay in the engine bay.