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Old 07-17-2017, 08:54 AM   #1
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Engine Warning Alarm

My warning buzzer has been going off and on occasionally over the past few weeks. Very brief. Can go for hours, even days without going off. No change in Oil Pressure, Temperature or Voltage. I've run all the necessary checks. Do these warning buzzers ever malfunction?
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Old 07-17-2017, 05:50 PM   #2
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The simplest systems are sensors that short or open based on pressure, temperature, voltage level, fluid level or some other condition, causing the circuit to the buzzer to complete. The sensors can fail, wires to/from them can short or become loose, etc. More complicated systems feed the sensor's output to a circuit board, provide some logic, and decide what noise to make or what light to light when the sensor indicates an out-of-tolerance condition. Most of the logic circuits will fail eventually in the challenging marine environment, and how they fail is variable. Intermittent, unrepeatable alerts are the hardest to determine the source and fix and may indicate an impending major or minor problem. Keep watching for gauge changes when the alarm sounds.

Not sure what else you can do without knowing what the buzzer means. Is it the same buzzer that sounds when the key is turned on before engine start? (low voltage?, low oil pressure?) Is there something in a manual that can help? If it's an operational alarm (engine/drive oil pressure, coolant temperature, a fluid level, etc.) you should have gauges to give some confidence that all is okay or that might indicate a problem.
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Old 07-17-2017, 07:11 PM   #3
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Thanks for the reply. I guess I need to look into this more carefully. I'll check it out again tomorrow.
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Old 07-17-2017, 09:02 PM   #4
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Would be helpful to post the engine make and model.
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Old 07-17-2017, 09:33 PM   #5
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Quote:
Originally Posted by MacDuff View Post
Do these warning buzzers ever malfunction?
Yep, like everything else on a boat.
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Old 07-18-2017, 01:15 PM   #6
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It's a Volvo Penta TAMD40B 165hp engine. The buzzer is the same as the Test Warning Buzzer.
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