I have a 2002 Formula 330ss twin 6.2's. Just recently an alarm, two beeps every 60 seconds, started. Unfortunately, this alarm at two beeps per 60 seconds could be about 30 different problems. I had it computer analyzed ECM 555. Results showed zero water flow on the port engine, however, we know water was flowing through because the engine stayed cool with water temp reading the same as the starboard engine and direct touch with hand on each engines water jacket resulted in same temp. This alarm goes off if you are sitting still or if you are out on the water doing any mph you want. I suspect the sea water electronic sending unit is bad, but don't know where it is. Any help will be appreciated.
