RedactedNarrative: 7/30/15 All the information I have at this point is this sailing vessel was tied to mooring ball inside the harbor and was on fire.  2 people were transported to hospital for burns.
  
  8/12/15 According to the investigator from Marblehead Fire department owner of vessel was working on a minor problem with the engines alternator.  He had a special bracket made to mount the starboard alternator.  When he attempted to mount the alternator he realized he needed a deeper socket and planned to leave the vessel to purchase one.  He left the alternator unsecured.  He went above deck to call for a launch to retrieve him and his son.  After a few minutes he noticed smoke coming from below deck.  He went below deck to investigate and saw heavy smoke coming from the area of the engine.  He approached the engine with a fire extinguisher but it did not work.  He noticed flames coming from the forward/starboard side of the engine, in the area of the alternator.  
  
  Cause of accident was determined to be an electric event in the unsecured starboard alternator which ignited several "Class B" fuels located in the engine compartment.  This melted the plastic fuel filter, which allowed diesel fuel to contribute to the rapid growth of fire.  The fire traveled to the aft hatch, which was open, consistent with the burn patterns and damage found on the vessel.
  