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Is this a solid tone alarm or a beeping one?
Would you please post the full model number of the engine?
Do you know when the last time that a water pump impeller was installed on the engine?
There is only one impeller on the engine. There are two thermostats, are both of those new as well?
How is the oil level in the engine?
Is this a salt water boat?
I had to go and rescue one of my cars. Sorry for the delay.
If this is a salt water boat, The thermostats should be changed on a yearly basis. This is due to the effects of the salt on the metal of the thermostat. It will corrode it and can cause the T-stat to not open at the correct temp and thus cause the engine to overheat.
If the alarm is going off on both engines, you can also check the fuel for water.
There is not any alarm for water, but it will cause the engine to run poorly.
You can tell if they are corroded just by the look of them.
Hello, you had requested the phone call when I was off line.
Did you pull the thermostats and look at them?