Hello All - I have another one for you..........

I have a 1964 Impala with a 283 SB in it. When I leave the headlights on Low beams, I noticed that the element on both of the high beam bulbs are slightly glowing and never stop.........
I checked the high beam switch and it's fine. I've also replaced all four headlights....HELP!

Any suggestions?

Thanks,
James