Re: "ISOLATED GROUND" for Main engines and generators
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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.
On Tue, Jul 14, 2020 at 1:27 AM Marco Mancini <marcomancini61@...> wrote: