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I assume you have the new common rail electronic yanmar. What is the model number? is it 4jhlte as in your note.
What model Amel do you have and the hull number?
I might be able to help isolating the battery from the bonding. When you mention ground- are you speaking of the yellow/green bonding wire?
Is the battery negative wire connected directly to the engine block?
SM 376 Kimberlite
On July 15, 2020 at 2:58 AM Marco Mancini <marcomancini61@...> wrote:
Bill thanks for your answer.
we are aware of the problem and our mechanic as well. All the engine frame and the head of C transmission are connected to the ground cable. The issue now is that the sensors on yanmarr 4jhlte are connected with the engine CPU and we are understanding how solve the problem.
In any case we have the Anode on the h6 autoprop and also on the rudder.
Il giorno 14 lug 2020, alle ore 16:15, CW Bill Rouse <
> ha scritto:
I changed the subject of this thread. I answered Marco below.
Anyone else reading this thread, please note that this mistake is commonly made by yards and mechanics changing engines. It can also happen when a mechanic "repairs" a "no-start problem." Many "no-start problems" are the result of a failed 12-volt negative solenoid, which is part of the Isolated Ground system. I know of too many situations where the mechanic by-passed this solenoid, invalidating the Isolated Ground system.
Marco, no I do not have a schematic of the Amel Bonding (yellow/green wire). Also, it is important to note, that Amel refined and changed this wiring and what was connected over many years with many changes. This bonding wiring schematic was not documented in any detail until the Amel 50 manual, which seems to be very complete and designed in such a way that a novice can understand most of the detail.
When discussing this with your mechanic, it may be useful to tell him that the Amel Bonding system and the Main Engine and Onan Isolated Ground (12-volt Negative) is similar to what many boat builders use when producing an aluminum boat to prevent the aluminum hull. from disintegrating from electrolysis.
You will know that you have the wrong mechanic if he tells you that this is not necessary. If he installed a non-isolated ground engine, I believe that you should make changes to the 12-volt connections engine, and until you do make changes, you should maintain a good anode on the propeller as well as the rudder.
Dear Bill thanks a lot for your valuable information. I will go thought with the mechanic it and I let you know.
Do you have a schemE of the SM GROUND LINE, I MEAN the cable that connect all the metallic objects on board and that end up on the rudder axis?
I don’t remember if in the engine compartment the ground line exist as a wire or it is substituted by the steel frame on which is ploughed the engine and then the ground line continue as a wire in the aft cabin untill the rudder axis .
On the other hand I remember that the aft keel bolt , the C transmission are connected to the engine frame. Do I remember exactly ?
really thanks for your support . It will be a pleasure sailing with you in the Naples Bay .
Il giorno 13 lug 2020, alle ore 14:53, CW Bill Rouse <
> ha scritto:
I attached a page from my Amel Book which my answer your question. If not, email me at
<Amel Isolated Ground (12DC Negative) Engines and Generators.pdf>
Bill it is nice to have your comment .
I have to check for this .
What do you mean ? I think I don’t have sufficient knoweldge about your question. May please provide me additiional info ?
as you may image we carry 2 alternators one for the 12 volt engine / onan battery charger ant another one at 24 volt for the other batteries.
Il giorno 05 lug 2020, alle ore 21:30, CW Bill Rouse <
> ha scritto:
Did your mechanic Isolate the 12-volt negative?
Are you still using the AutoProp H6 with the new engine? If yes, did you have it modified in any way?