I had the same issue with my 2006 5.0 litre this past summer, intermittent no start, no crank, no sound. This has always been typical of a bad starter solenoid. I also read of the relay that sits on top of engine so I purchased both the relay and starter solenoid, when the boat would not start on the lake I replaced the relay and it would still not start, after a bit it started. took it into the dock and once cooled down replaced the starter solenoid, worked fine the rest of the season! Need to go online and get the actual volvo penta solenoid, had bought one prior that did not match up.
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