2004 Ford Focus alternator

My cars altinator was on blink whineing when driveing and battery going up and down in voltages while drivein i took out altinator and tried cleaning its terminals but put back in started car ticked over 2 minutes ghen start spluttering knocked of then no reds or nothing on dash red lights that is acc so im thinkinv is it just completely screwed or did i do something wrong the positive gets so hot wen left connected to terminal any ideas wat it is or simple as getting brand new alternator cars a mondeo but i said focus cause didnt have the option in list of cars

Get a new alternator and see how it goes.