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post #1 of 12 Old 08-09-2012 Thread Starter
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Unhappy Yanmar buzzer ON

I have a YANMAR 2GM. My buzzer is on when the engine is not running. Two lights are also on. The sound is not as loud as a regular alarm. As soon as I have the engine running, all alarms stop. All systems are running fine.
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post #2 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

Are you asking a question?
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post #3 of 12 Old 08-09-2012 Thread Starter
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Re: Yanmar buzzer ON

Sorry I was not clear. I have tried to silent that buzzer. As soon as switch the power on the battery, that sounds comes on. What can be wrong? Could it be the switch that does not turn off? I do not see any corrosion behind the yanmar panel? I don't know what to look for.
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post #4 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

The buzzer is almost certainly a low oil pressure alarm. Once the engine begins to run, the oil pressure generated by the pump opens an electrical circuit to silence the buzzer. If the buzzer doesn't stop very soon after starting the engine, you know that you need to shut her down so you can find out why you've got no oil pressure.

Now, the buzzer should only start to work when you turn the engine switch on. Since it is starting as soon as you turn your (master?) battery switch on it looks like the engine power circuit either has a short or the switch has been bypassed.

Last edited by PorFin; 08-09-2012 at 10:34 AM.
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post #5 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

When the engine is cold only the oil light should come on when you turn the key. That the temp light also comes on indicates either a short or a defective sensor.
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post #6 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

If the panel lights are similar to my 3GMD's, there are actually three lights, alt., oil and water temp. When cold, only the oil sends a signal to the horn, but I believe that both the oil and alternator turn on warning lights when cold. The alternator only uses the light, never sounds the horn. If two lights are coming on, first step is to decide which ones they are. However, no lights or horn should come on until the engine switch is turned to on, even if the battery is on.

I had exactly this situation last spring, when the horn would come on with the battery switch. It turned out to be a grounded power line connection on the back of the starter. There is a heavy positive wire connected to a lug on the starter that is very close to a ground lug. In my case, the engine had been lifted by a mechanic for some other work, and in doing that, the wires must have had some force pulling on them, or something pressed on the positive wire and caused it to shift just enough to connect with the negative lug. Hard to see, but you can feel around the lugs to be sure that there is at least a little spacing. There is a black rubber cap on the positive wire on the starter, but it didn't protect the underside of the connector. In my case, the connection let the engine circuit power up directly from the battery, bypassing the entire panel, switch, etc. I'd look for some similar way for the power from the main cable to be shorted into the harness. Just the wrong connector being a little loose could do it.

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post #7 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

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Originally Posted by Michelb View Post
I have a YANMAR 2GM. My buzzer is on when the engine is not running. Two lights are also on. The sound is not as loud as a regular alarm. As soon as I have the engine running, all alarms stop. All systems are running fine.
That's exactly what's suppose to do..Engine not running buzzer sounds due to low oil pressure. Buzzer turns off when engine is running with normal oil pressure.

If the buzzer comes on when the engine is running then I would be concerned.

Was this a trick question?
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post #8 of 12 Old 08-09-2012
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Re: Yanmar buzzer ON

Stupid question here, but you mention turning the battery on and off, but not turning the Yanmar panel key switch on and off. You have turned the panel switch off, right? If so, could it be stuck on?

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post #9 of 12 Old 08-10-2012
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Re: Yanmar buzzer ON

Have you shorted out the battery lately? If you reversed + and - even momentarily, you likely burned out the 3 main diodes in your alternator. This seems to cause the alternator to feedback back through to the buzzer as soon as the batteries are turned on, before turning the start key on. Once the engine is started these alternators still put out a small charge that will turn off the light and stop the buzzer but the alternator is mostly fried.

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post #10 of 12 Old 08-15-2012
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Re: Yanmar buzzer ON

Hi,

This sounds like a ground problem.

I just rebuilt my yanmar, and in disconnecting the engine for haul out I noticed a similar problem. I turned on the cabin lights (or any other switch) and the buzzer would start to softly buzz. To fix this, I just connected electrical ground wire, which was bolted to the rear of my engine where the transmission bolts onto the engine, to the battery ground wire, which was bolted to the front of the engine. My mystery was solved.

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