>>28542962
I'm not sure which pin is which, but high and low beam sealed beams have three pins just like an H4 bulb, but high beam only sealed beams are just two pins.
So from the factory, you have two lights that come on for low beams, and when you flip on the high beams, those two lights switch to high beams, but then there's two more lights that come on as well.
That's what my wiring harness helped me change, now I have four low beams and four high beams, and each light is an H4 with three pins.