https://amelyachtowners.groups.io/g/main/files/Miscellaneous/_Kit%20isolation%20Yanmar.pdf

Tom,

I believe this is what you have. This is the newer conversion.  I see the relay you are referring to. The only thing I do not see in photos are the dual wire senders. I do see that they used them as you can see a bunch of sender wires at the Valeo Solenoid. If you will notice they show  that they are still using the diodes. They are covered in heat shrink tubing with a solderless connector at either end.

I also think I see a tranny oil cooler mounted on the tranny. Do you have this?

Above  is the link and the wiring diagram of the newer conversion of the yanmar of the isolated ground.

Fair Winds,

Eric

Sm 376