Dash lights will not turn off!! 72 dart

Thanks very much for the reply I believe that's what happened with the alternator because I took it out and got it tested and it failed every test, got a new 1 and the high charging is gone, before I got it tested I put a multi meter on the back of the alternator and it was reading 18 volts as well directly off the alternator, but the high current issue is fixed now I also put in a new regulator too after that happened

I will have to check all this I can pull the switch in and out and control the park ights and the headlights like normal

The dimmer has no effect, after the 1st time it happened I was able to turn the dial and everything went back to normal for a couple days but now they are back to being stuck on and it has no effect, I will have to go out and try pulling the fuse next thats the only thing I haven't done other then pulling the cluster and inspecting that
Sounds like it might be in the switch.
Dana has disassembled a switch for repair and posted photos. edit Found it 67 Dart Headlight Switch Demystified
Removing the switch is a bit of a pain.
Need to be able to hold the side button so the shaft with knob will pull out. Then unscrew the nut (there's a tool or you can make do with a snap ring or needle nose pliers. Then unlip the wiring connector.