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Alarm beeping

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i posted the RPM Gauge thread thinking it was causing the alarm to sound. after reading in the manual, me thinks, it is not related. the alarm sounds after i hit 3000rpms(digital) only under load. i know its not good to run that high of rpm's in the driveway but i was trying to replicate the alarm. i wasn't sucessfull. took it to the lake, alarm goes off. all gauges were reading fine. i let the boat cool down from 160, started it up ran it about 1200rpms back to 160, no problems. watched the oil pressure after i idled around the lake for a hour, pressure was good. stayed in the deep water, so i won't trip the depth alarm. when the boat was off played the radio for an hour, boat started right up. i am out of ideas. my Malibu dealer is over an hour away, i'm trying to fix this without going to the dealer. thanks for any and all help.

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The transmission temp sender could be faulty. When my boat was new the beeper would go off at high speeds. I checked the fluid temp with an infra red thermometer and found fluid temp was fine. Changed the sensor and have never had a problem since.

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i pulled off the cooler and had a small leaf stuck in it. i plan on taking the trans. lines off as well. this work thing is getting in the way today, so it will be a job for tomorrow.

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I only know of three things that trigger an alarm; water temp, oil pressure and trans temp. The ECM might also set an alarm if there is a trouble code with the engine caused by a faulty sensor or control device, much like a check engine light on a car. But this I am not sure about.

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