Motored about two hours without issue to a yard to have our h36 hauled. About 3 minutes out from the travel lift slip I backed the '08 Yanmar 3YM30 down from 3000 RPM to 2000RPM to slow down and start cooling the engine. At the slip I then dropped to idle and neutral as I was coasting into the slings and heard the panel alarm (yanmar/VDO type B) begin to "squeak" a little (not full-on loud), and noticed I could see at least 3 of the 4 panel idiot lights flashing on and off together (oil, water, saildrive and alternator). Unfortunately I didn't notice which three. It stopped with increased RPM. This happened a few more times each time I dropped back to idle, but just before we shut the engine off as we were being lifted, no more lights and alarm at idle. With all the excitement of getting into the slings I couldn't stop to look at idle RPMs or any other details. I'm thinking now that the engine RPM dropped well below the 750 RPM set point, to the point where the alternator output was less than the battery voltage, as if the engine had stopped. But why would the engine idle that low after a long motor?
TIA, Dan
TIA, Dan
