[Ggmac]

If original, its a soldered connection with the wires and having bullet connectors on there ends .
Don’t forget many , many hands have been on these old cars , many parts have been changed , sometimes correctly, sometimes not . They used what was on hand, especially towards the end of its life .
You’re still 6 volt pos ground, have you plugged in your old headlights to see if both elements come on ?
The hi beam switch is a simple switch that gets a lot of trash and water near it . I’ve gotten good results by simply using my foot to push the switch rapidly many times with some good pressure. Then check the voltage again ,