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Old 10-04-2013, 19:03   #1
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Yanmar 2GM buzzer problem

The buzzer on my Yanmar 2gm does not come on when I turn the key on and does not come on when I kill the motor. The buzzer does come on when I try the system test toggle switch. Does anyone know the problem? Everything else is normal.

Thanks
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Old 10-04-2013, 19:47   #2
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Re: Yanmar 2GM buzzer problem

Do you have the wiring schematic? I've been study the wiring of our 2GM of late. Don't know much, but it seems that the system test lets you know if the buzzer is functioning, not the pressure gauge.

Below is the schematic for my 1987 2GM20F. Maybe it will help.

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Old 10-04-2013, 20:35   #3
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Re: Yanmar 2GM buzzer problem

Not familair with your system, but...
I have seen one where the buzzer works with a fuel pressure or other switch in the circuit, so the buzzer only functions when the engine runs. This might explain why there is a test switch. You can test the oil pressure or temp switch with a voltmeter or by grounding it.
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Old 10-04-2013, 22:15   #4
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Re: Yanmar 2GM buzzer problem

The buzzer wire is positively charged by the ignition wire, it runs to the oil pressure switch on the engine near the forward end. When the ignition is turned on, and the engine is not running (i.e., not creating oil pressure), the switch is the ground. When the engine is running, the switch turns off, shutting off the ground to the oil pressure buzzer. The toggle switch is a separate connection to ground, making the buzzer go off. Sounds like the oil pressure switch might be faulty.

If you install a tee where the switch is located, you can add an oil pressure sender to allow you to read the actual oil pressure. I mounted a red alarm lamp above the oil pressure gauge, in parallel with the buzzer. That way anybody can understand that the noise is oil pressure related.

While I was at it, I added additional idiot lights and buzzers to let me know when the engine was overheating, when the waterpump stopped doing so, when the fuel filter vacuum got too high, when the alternator stopped making juice, when there was water in the fuel filter, and when the regulator had been switched into small engine mode. Each buzzer was a different sound (Radio Shack sells them) so I can be asleep, offwatch, and know what alarm just went off.
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Old 12-04-2013, 05:29   #5
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Re: Yanmar 2GM buzzer problem

Thanks for the feedback everyone. I found the oil sender, clean it up and now everything is working well! I really appreciate the help. Roy M., I also have a Searunner I just purchased and I'm really loving it. Busy trying to get it up to speed. Your boat is very impressive.

Thanks again,

Stu
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Old 12-04-2013, 07:26   #6
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Re: Yanmar 2GM buzzer problem

Nice looking panel Ron!!!
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Old 13-04-2013, 05:51   #7
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Re: Yanmar 2GM buzzer problem

[QUOTE=Roy M;1

While I was at it, I added additional idiot lights and buzzers to let me know when the engine was overheating, when the waterpump stopped doing so, when the fuel filter vacuum got too high, when the alternator stopped making juice, when there was water in the fuel filter, and when the regulator had been switched into small engine mode. Each buzzer was a different sound (Radio Shack sells them) so I can be asleep, offwatch, and know what alarm just went off.[/QUOTE]

Crankin'
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