@SN2001james on older vehicles and boats there are two power sources for the ignition coil one is 12v during crank and the other runs through a resistor that knocks the voltage down to around 6v when you are running. They found that ignition components lasted a lot longer that way. My guess would be that you have a broken wire in the 12v start circuit to the ignition coil. Not sure about the exact wiring on that boat. You may want to try the forum over on planet nautique. Those guys know it all.