Truck dies after a few minutes of driving

Just put a new battery and alternator on my
98 Chevy c1500 and the alternator gets super
hot and I think its causing the truck to die
after a few minutes of driving. Because of this
I replaced both battery cables and tried a
different battery and a different alternator and
same problem. I also cleaned all the grounds I
could find, still dies after a while. Only thing I
have left is the plug to the alternator to
replace then I’m out of ideas.