Voltage regulator location 1966 dart

When you find it, you can replace it with the electronic version instead of the taller solid state ones. The fusible wire in the ones when I was using the solid state ones would burn out within A hudred or so hours of operation.

If they moved yours it might be over by the ballast. Look a component with a blue and a green wire.

The taller Solidstate cover actually glues on pretty well over the electonic cover, so most wont even know you did it. Like this one.
20230314_132024.jpg