Tail light stay on

OK. Approach to diagnose stays the same.

requoting 67Dart273:

1....Disconnect headlight switch. If the power stays on, then it is not coming from the light switch

2....With the problem "showing," access the kick panel rear harness connector. Look up the wire colors, and probe all pins of the connector. With brake lights off, and key off, there should be only 1 or 2 pins active. The tail lights (because of the problem) and the dome light circuit.
Pull the fuse for the dome light circuit, that should kill the tail lights IF it somehow crossing wires in the harness.
If so, verify by pulling both bulbs, separating the kick panel harness, and then check continuity. The tail light wire should NOT show continuity to any other wire in the harness, or to ground.
If it does, the problem has to be right there in the rear harness

3..If 1 or 2 brings no answers, there is not much left. The path from the kick panel connector, at the tail light circuit, up to the headlight switch, is a short length of wire. There should be nothing else on that. If it is still getting power, trace the harness from the kick panel to the light switch.

Only thing to add is that we can see the fusebox circuit wires are missing and damaged. So clean and take apart far enough to figure which ones are damaged.