I have a mercury 40 aprox 1992 when ignition turned on you get the first intial beep but some times you get a constant sound even without the engine running by looking at other peoples problems on this site it sounds that constant noise is cooling and beeping is the oil but I am getting no over heating and water coming out plus oil full as this model is an oil injection looked at connections in ignition/gear shift but all ok please can someone help me look in the right place as the noise comes and goes and is driving me nutt's
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