Your English is very good. My Santorin is 1994, no 96. The main thing that should happen when you turn the key (as well as the green light turning on) is an instant decrease in the propellor shaft revolutions. This is caused by the alternator producing resistance by producing electricity. No decrease, no electricity.
I am not an alternator specialist, but this must mean the that there is a problem with the actuating circuit from the key.
Has the alternator been working before this?
Ocean Hobo SN 96.