Can anyone tell me how to change the water pump/alternator belt on a 1977 280z (datsun)?

Hello Miss Shelly.Since you are asking it seems that you are going to attempt this your self.I suggest U buy a repair manual(Chilton's or Haynes for about $16.00 @ most parts stores) Anyway if your Datsun only has one belt,it's as easy as loosening the alternator screw %26amp; the mounting screw.(at the bottom).