we have a old navel landing craftvwith two 671 and she went to bottom. she was refloated and the engines dried out and got runnig there is a new electrical ,starters and alternators. the batteries are new as well...the boys left one of the battery switchs on over the weekend and batt drained enough so wouldn't start the eng. i charged batt and it fired right up but after i shut it down would not turn over just click. i tested battery with load tester and was good..after the engine sit awhile it fires right back up. im stumped and not a desiel guy..both engines do this im scratching my head. any help would be great.