sounds like it is the overheat horn,  but one of the omc gurus will give you a better opinion.  how long did you run it with the horn going off?  might want to plan on a water pump and t stats in the future. 
 
on a side note, looks like we're gonna get a blow in the gulf, time to start getting the generators running and pick up the yard furniture.
		 
		
		
		
		
		
		
		
		
	
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