The model of Yanmar
wasn't mentioned by the op. I have a 3jh3 which developed a leak in the heat exchanger
housing which of course was on the far side of the engine
and not easily observed. It dripped salt water
over my starter and solenoid during a 24 hour run off shore with no wind
. The water
of course evaporated and the salt
eventually bridged the space between the battery
connection and the start relay terminal. I never heard the starter over the normal boat noise
but I assume it was engaged for a rather long period of time since the rubber cup over the + connection was melted along with the insulation
completely burned off of another wire. It took a new heat exchanger
, wire, and starter to fix the problem.
Do you guys really turn off the battery
switch every time you stop? I just leave my fuel
cut offs in the stop position when I'm not using the engines.