Dash lights will not turn off!! 72 dart

Don't forget, Mattox the high charge problem could be right at the alternator---the infamous wrongly configured field connections

Anyhow the lights...........Only thing I can think of is that you overheated the harness with the charge problem, and it internally melted some wiring and crossed wiring

It is IMPORTANT that you understand how this works

Power for the instrument lamps in the headlight switch comes from the tail/ park part of the switch. First make certain those are coming on/ off properly with the switch.

That circuit feeds power TO the dash dimmer control

Does the instrument dimmer (twist the headlight switch knob) have any effect?

Now the dimmer control feeds it's output, on tan, down TO the instrument fuse in the fuse box. This is the ONLY fuse that works this way. From that fuse, ALL dash dimmer controlled lighting is fed out on ORANGE wiring

Next pull the INST fuse. This is normally located at one end of the fuse box.

If that kills the lights, then you either have a harness "cross," or some modification by you or others in the harness has caused a problem