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Buzzer on Yanmar 2YM15


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My Yanmar 2YM15 on my J/95 doesn’t sound a buzzer when the key is first turned on or when the engine shuts down. 
 

I don’t see anything on the control panel or behind the control panel that looks like a buzzer. Is it possible that it was never equipped with a buzzer? Or, can I get any guidance as to where the buzzer should be?

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These things work ok when the engine is not running.

Often inaudible when the engine is running.

Get a man-size alarm warning, a motor-bike horn etc.

If you have a temperature alarm switch as well as the oil switch, a couple of diodes will enable the oil / temperature lights to identify the problem.

It's usually obvious anyway.

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Are you getting alarm lights for low oil pressure with key on engine off?  The buzzer should be active with any alarm.  If it's a newer panel and you are not getting any alarm lights it might have some solid state logic with a start delay on oil and run only alarms.

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Did the previous owner install a newer alternator / regulator? Balmar is the usual aftermarket regulator and their instructions are a bit unclear.  Fairly easy to miswire it in a way that everything works except for buzzer.

If it's the stock alternator (Hitachi I think), could be a simple as the brown wire has become disconnected from the alternator. I think it needs to see ground, but I can't recall for sure.

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On 8/19/2021 at 9:31 AM, Quickstep192 said:

My Yanmar 2YM15 on my J/95 doesn’t sound a buzzer when the key is first turned on or when the engine shuts down. 
 

I don’t see anything on the control panel or behind the control panel that looks like a buzzer. Is it possible that it was never equipped with a buzzer? Or, can I get any guidance as to where the buzzer should be?

If the Yanmar buzzer is pricey, let me know and I’ll send you a free one. It’ll be a Mercury one, but it’s the same wiring and voltage. 

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5 hours ago, Quickstep192 said:

Weirdly, after I posted this, the buzzer started working. Go figure...

Likely a connector/corrosion problem. (90%, make that 99%, of boat electrical problems are either a connector or corrosion.)

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