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    over heat alarm 2005 Mercury Optimax Saltwater 150XL

    Newbie alert and female at that. Now that boating season is coming back, i am trying to diagnose my over heat alarm. We bought the boat last year it ran fine first time in the water. As a precaution we dropped the L/U and changed the impeller, 2 gaskets, and the lower unit gear oil, which looked...
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    2005 mercury 150 optimax overheat alarm

    changed impeller last spring. Pissing fine, 2nd time taking it out on new impeller lake tahoe (fresh water) 7400 ft elevation. full throttle 3500 rpm 10 minutes long alarm turned on (overheat). turned off motor, turned back on. continued on at 10 miles per hour for the next couple of hours. At...
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