Mopar friend in PA needs help

How about the key ignition switch itself? I had to change one out in my '69 Satellite years ago.

Possibly clean the two contact points where the dash frame bolts to the chassis. This is where the dash gets it's main ground. They are located on each side of the dash, above the kick panels. Just loosen the bolts (one at a time) enough to slip a piece of fine grit paper between the contact point. Don't remove the bolt.

Look behind the dash ammeter and see if the terminals appear normal or if they show signs of being hot.

Check out the back side of the fuse box for any signs of abnormality.