This is interesting. I’ve never seen a car wired so that both filaments of an H4 would be on at the same time. Seems to me it would overheat the bulb. Makes sense for an H1 though.

I’m a bad person. I have H4’s in my ‘71... for the past 20 years. At least I don’t have the city lights wired in. In my ‘74 I do. For either car they are not original in the US. We were stuck with sugar scoops and sealed beams. So does it really matter?