Shaft alternator on Santorin don’t work


ste.dente
 

Dear Amelians, I hope some of you can help me solving my problem. My 1994 Santorin is, as usual, equipped with a shaft alternator. Last year I made a check of the alternator because it didn’t work correctly. The check was ok : the alternator worked normally “ at the bank”. I put it in place again. But now, when I turn the key in the galley in order to activate it, only the red lamp light on but the propeller continues to turn free and the green lamp doesn’t light up.
I checked the wiring coming from the key to the alternator and something strange came out: when I turn the key ON, no volts are checked; if I turn the key OFF, the tester tell me 13V. May be some of you could suggest me how can I control the wiring better ? Or something else? 

I really hope you can understand my poor English. Thanks everybody for the attention. Fair wind
Stefania
SY EUPLOIA 
Santorin #93
Actually in Corse


Ian Park
 

Stefanie
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?

Ian
Ocean Hobo SN 96.


ste.dente
 

Hi Ian,
thanks for your answer. Yes, the alternator has been working before this; I didn’t use it so much because of the poor wind in Mediterranean Sea that means poor speed under sail. How do you think I should control the actuating circuit? Is the normal tester sufficient or do I need something else? Do you know if there is a relay in the actuating circuit? Last question: do you have on your Santorin also the red light under the green? Thanks and fair wind

Stefania

Il giorno 14 lug 2021, alle ore 23:32, Ian Park <parkianj@gmail.com> ha scritto:

Stefanie
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?

Ian
Ocean Hobo SN 96.