It sounds like the alternator belt is slipping with the high electrical load. Tighten or replace the alternator belt.
A vehicle's starter will being making a loud screeching noise if it does not align properly with the flywheel. It slams against the flywheel and grinds against the surface.
It could be a couple of things but by tour description of a screeching sound, it sounds like it could be the fan out of alighnment, which is pretty common
you have a bad alternater or belt
a screeching noise
it might be that the wheel is loose or chech your car brakes they might be screeching on the brack disk
either your belt(s) or brakes most likely
why does my starter make a loud screeching noise when i start it?
Eagles make a screeching noise
Fruit bats.
good chance the fan belt is slipping when driving may need tightning up this wouold cause a screeching noise.
fan clutch
they make a screeching sound