My 2003 Hunter 356 with the original 3GM30F Yanmar diesel with only 685 hours suddenly won’t start. It will turn over once, stop, and then the Inverter sounds an alarm and turns itself on. The wet batteries are 4 months old and well maintained (as is the engine). The DC panel reads 12 on battery strength and the other electronics, cabin lights, etc. work fine. It doesn’t grind or whirr like a bad starter. It really sounds like not enough battery juice. I know you guys have the answer.
ONE MORE ITEM - the boat is mostly parked dockside plugged into AC power.
ONE MORE ITEM - the boat is mostly parked dockside plugged into AC power.