How do you replace the alternator on a 1997 Toyota Hi-ace van?

To replace the alternator on a 1997 Toyota Hiace van, first disconnect the negative battery terminal to ensure safety. Remove the drive belt by loosening the tensioner and then unbolt the alternator from its mount. Disconnect the wiring harness and carefully take out the old alternator, then install the new one by reversing the process. Reattach the drive belt, reconnect the battery terminal, and check that everything is functioning properly.