Humming/ Buzzing in dash

[Mark1971]

Hello all,
I just developed a buzzing sound coming from a black round disc with a single wire. The disc has a round hole in the middle of it and I see a metal disc inside. I was driving the boat for several hours and hit a few big waves that’s when it started. I thought it was the radio till I found the source. I can’t trace the wire any further than the dash have no clue where it ends. I cover the hole and it stops or muffled the sound. I am not sure if it’s part of my depth finder or not which is a hummingbird 610. Just a round gauge that shows depth no graphs.
I have a 97’ wellcraft eclipse 196ss with 5.0 alpha1
Thank you
Mark

 

[MSST8DOG]

A friend of mine had the same issue a couple of months ago. It was his horn. He bought a new one and all is good.

 

[Mark1971]

What is the black disc? It is only about a 1/2” dia.

 

[Chris1956]

A lot of MerCruisers have a warning horn for overheat and loss of oil pressure. If you turn the ign key on and don't start the motor, after a few seconds, the no oil pressure horn will sound. Is it the same one?

 

[Mark1971]

I will have to check when I get home. My temp gauge was at 160 when it was running and oil pressure was around 50 while trolling

 

[Chris1956]

That is good, but the alarms do not run off the gauges. They run off separate sensors....

 

[Mark1971]

Here is the issue

 

[Chris1956]

Sounds like a shallow water alarm. See if you can reset the low water alarm threshold, or turn it off.

 

[Mark1971]

What’s weird was the gauge was not even showing numbers like no power but if that’s the case how was the alarm going off? Seems like all connections are tight. I turned the key to supply power alarm came on right away displayed showed 2.0 which is correct but the #’s were not very solid color like sort of faded or not getting enough power to it.

 

[Alumarine]

Try disconnecting the power to the depth finder and see if the alarm still goes off.

 

[Chris1956]

OK, don't believe me.. I see 2.0 feet on the gauge.

 

[Mark1971]

Chris?

 

[Chris1956]

Not sure what you want. Either the gauge is set to alarm at 2 feet, or the electronics are bad. The first test is to turn off the alarm off. The OEM web 'site may have a manual. If that doesn't work, and the gauge works correctly otherwise, kill the buzzer and see how it goes.