Headlights turn off once High Beams are turned on

Hey everyone, I have a 72 Challenger that has been sitting for over 30 years. Bought it a couple years ago and just finally got it on the road a few weeks ago. All of the electrical works, except once I turn on the high beams. I have already put over a thousand miles on in the past few weeks (I have a long commute for work lol) and almost half has been night driving. The low beams work great and I have no issues there, but once I turn the high beams on, after a few minutes the headlights...

Headlights turn off once High Beams are turned on