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Murphy Relais and master Volt proAlpha, ground (-) issue
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Hans-Joerg Wildhagen
Hi Ameliens The red led for alternator not charging at the 24 Volt panel is lighting. But the alternator is charging the batteries. This error must also go to the NMEA 2000 Bus because my TZTouch is showing the error too even when the engine /alternator is not running. Any ideas where this signal goes to the bus system NMEA 2000. And there is another problem with the minus LED at the ground test. It’s light up by pressing the button. I could take off all the ground cable, but that’s a lot. Any idea to do it faster? Thanks Best Regards Hans Wasabi Amel 55 no 13 |
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That red light is for the 24 volt alternator. There are relays that could be faulty. How do you know the house bank batteries are charging? If you are skilled with relays and schematics I can send you more information, but there is not a simple answer. It could be anything including slipping belts, faulty electrical circuits, faulty alternator, bad relay and/or a bad connection. Best, CW Bill Rouse Amel Owners Yacht School +1 832-380-4970 | brouse@... 720 Winnie, Galveston Island, Texas 77550 www.AmelOwnersYachtSchool.com On Tue, Feb 21, 2023, 11:24 Hans-Joerg Wildhagen <carpediemsail@...> wrote:
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Hans-Joerg Wildhagen
Hi Bill I startet the engine and went to 1300 rpm. The xantrex showed before 99,5 % and after 15 minutes it was 100% I have this drawing and i am familiar with electronics and software Question is how comes this signal to the NMEA 2000 Bus? Because the failure is also seen at tztouch, see other picture 
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Hans, I do not believe this light is connected to the NMEA bus. The light I believe is connected to the "excite relay" for the 24v alternator. The ignition closes one side of the relay with 12 volts, the other side closes allowing 24 volts to excite the alternator. It is all designed to illuminate the light if the alternator is not excited. Although your issue could be caused by many different things, I think I would start with these relays and their connections, both inside this box and on the alternator:  This is a portion of the wiring diagram from the A50. I expect it will be similar to the 55 because it is similar to the 54.  I am not an electrician and this is about as far as I can go with this. Bill
On Tue, Feb 21, 2023 at 1:43 PM Hans-Joerg Wildhagen <carpediemsail@...> wrote:
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I agree with Bill. The alternator isn't connected. I think what you are seeing on the Furuno is a battery voltage alarm. This is strange because the NMEA 12V power is created my a 24V-12V convertor beside the alternator box in the engine room as far as I remember. Do you have a failing DC-DC convertor? The only battery alarm on the boat is the one on the display at the nav table as far as I know. Whats do that say your battery level is? Voltage?
On my boat I installed a Mastervolt Easy View 5 and connected the master volt alternator, and all the inverters and solar chargers. I CAN see alternator issues on that display but it's not hooked to N2K and thus I don't see how it's on the Furuno. I installed the Easy View so that diagnosing master volt related issues would be easier. Same reason I added a Volvo to N2K gateway so engine issues/metrics can be recorded by the boats black box (yacht n2k recorder) and be visible on the TZ. Billy (55#56) |
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Billy Newport
Correcting myself. The Furuno may be powered directly from the boats 24V so the battery alarm should be indicating low battery voltage. The N2K is powered from a converter to make the 12V.
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Hans Jörg - check that the connections for the cables on the alternator are tight. They are so close to the engine room insulation that Amel had to cut a piece out of the insulation to install the alternator - at least on my boat. As a result, the installer didn‘t get them tight enough so they came loose.
Hope that helps. Joerg Esdorn A55 #53 Kincsem Currently in Scotland |
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