A few melted spots in headlight harness

Once I saw how bad the wires were, I remade the connections. Also this car lives outdoors in the PNW and gets wet floors frequently, so I doubt that helped. She's garaged in Spokane right now, hoping to be able to move into a place with a garage after I "graduate". At home, my dad's 68 Charger and grandpa's 56 Metropolitan get the garage space.
If you used the standard parts store terminals, they're not great. Crushing the barrel isn't usually as strong and tight of a connection as the factory type. And the factory type has support for the insulation.
Headlight connectors have a wider spade and need a wider terminal than the typical Packard 58.
Sources for Chrysler type wire terminals
Take the time and recheck the insulation through the buckets. Having the lights go out at night is never fun!

You don't have to spend the big bucks for Cibie, or even the Hella 'Vision Plus' H4s.
The GE Nighthawk sealed beam in 7" round is pretty good. They do have shorter life so buy an extra and they do draw more current on low beam than regular 6014 or 6024s
IIRC they are sold as H6024NH.
You can buy a relay harness from Crackedback all made up and ready to plug in. You just need to rout it, plug into one of the existing headlight connectors, and connect the fused power to the alternator output stud. That will take the electric load off the original headlight circuit.
If you prefer to make your own, starting with a kit from Daniel Stern will get you good quality components.

I made my own over 10 years ago. That me run H4s even though the headlight connector looked like this.
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The relay system works with a damaged circuit because it takes less than an amp to turn on the relay.