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Loud buzzer will not stay off

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Please help. I have plans to take my son and his friends to the river for his b-day and don't have time to take it to the dealership. I have a 2007 Chaparral 190 ssi with 48 original hours on it. A 4.3 mercruiser engine with the Alpha 1 drive. I took it out today for a while. When you initially turn the key to the on position there is a loud buzzer. This buzzer typically goes off once the boat is crunk. After running the boat near WOT for a while the buzzer comes on. If I back out of the throttle it will go off briefly. Then it comes back on. If I play with the trim it will go off sometimes, but comes back on. It is loud and constant. I have searched and all I have found is that it means low oil somewhere. I have checked the motor and the drive oil. Both are full. It does not do it at idle and it takes longer before it will come on at lower speeds but it always comes on eventually and goes off. If I turn the boat off it will shut off and will not come back on until the boat has been ran close to WOT again or ran at lower speeds for a while. RPM'S that I have noticed when it comes on are 3,000-3,500 and speed is generally 30+ mph with 46mph top speed. Serviced at the end of season last year at the chaparral dealer. Thermostat changed and changed the prop as well as fixed the prop due to a stripped shaft when the boat was ran into unknown shallow water. Stored here in southern Mississippi inside my insulated shop over the winter. Always use Sta-bil and higher grade gas. Other than the buzzer the boat runs fine. Oil pressure and temp gauges reading normal. Could it be a sensor or what? I'm sure this has probably been discussed somewhere and I did look for it but I didn't find anything with a solid answer. Thanks in advance.

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What does your temp gauge show when the alarm goes off? Has the impeller been replaced?

brick

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I did not record it. I plan to take it out tomorrow and mark the oil pressure, temp, exact rpm and speed that it comes on and goes off at. This is my first boat and I came across this forum and signed up. I should get all the info that may help tomorrow.

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