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Author Topic: Alarm Buzzer Chirping  (Read 291 times)

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Ken Krawford

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Alarm Buzzer Chirping
« on: November 07, 2019, 02:59:58 AM »

I've noticed recently that my temp/oil pressure alarm buzzer has developed an intermittent "chirp" when motoring at higher RPM's (2500-2700}.  It is an off/on phenomenon and goes away if I lower the speed to the 2300RPM range or less.  My oil and coolant levels are ok as is the connection on the oil pressure sender.   I haven't pulled the instrument cluster yet to look for a loose connection but wondered if anyone else has experienced this and what they found.  There are several other reports of this on the C350 message but no fixes are posted.
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Ken Krawford
C350 Hull 351  2005 Universal M35B

KWKloeber

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Re: Alarm Buzzer Chirping
« Reply #1 on: November 07, 2019, 11:03:59 AM »

Ken

Do you have an oil pressure gauge - if not you have a low oil pressure switch (not a pressure sender.)

The B series are particularly problematic to troubleshoot the alarm and oftentimes end up nowhere.  IIWMB Id replace the switch, taking special attention to the connection. It may solve it but would be good insurance anyway.

The Wb harness is untinned, type 2 STIFF SAE, not type 3 flexible tinned marine wire, and vibration can break off one or both switch terminal tabs. Its a known weak point.
So- Suggest you crimp on pigtails of Type 3 wire or carefully secure the harness so there is NO movement possible between the harness leads and the switch terminals.

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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Ken Krawford

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Re: Alarm Buzzer Chirping
« Reply #2 on: November 08, 2019, 03:26:39 AM »

Ken there is no oil pressure gauge - just the buzzer.  I'll check out the switch to start with since it's easier to access than the buzzer.  Thanks for the feedback.
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Ken Krawford
C350 Hull 351  2005 Universal M35B

Kyle Ewing

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Re: Alarm Buzzer Chirping
« Reply #3 on: November 09, 2019, 01:41:33 PM »

I had a similar problem a few years ago and traced it to loose wiring at the engine wiring harness.  I tightened all the connectors (I have terminal strips) and have had no chirp since.
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Kyle Ewing
Donnybrook #1010
Belmont Harbor, Chicago
http://www.saildonnybrook.com/

Ken Krawford

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Re: Alarm Buzzer Chirping
« Reply #4 on: November 10, 2019, 03:07:42 AM »

Thanks Kyle.  I'll put that on my list of things to check.
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Ken Krawford
C350 Hull 351  2005 Universal M35B

Ron Hill

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Re: Alarm Buzzer Chirping
« Reply #5 on: November 10, 2019, 02:36:28 PM »

Kyle : You might look at the connection of those spade connectors on the oil pressure switch.
I'm a believer in soldering connecters to insure a good electrical contact.

A thought
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TortolaTim

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Re: Alarm Buzzer Chirping
« Reply #6 on: November 21, 2019, 08:42:24 AM »

Mine only works intermittently. Worked when I had the survey/ sea trial, then quit when I bought the boat.  :shock: I took the panel off and cleaned (what I think are the right wires), and then it started working. Intermittently! Sometimes it do, sometimes it don't. I'm going to try to confirm which wires I need to replace, and then just rewire the whole thing with proper tinned marine wire and connectors. I do have the updated harness, but don't know exactly which wires feed the buzzer.
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Tim Callico
1989 C34 #957
M25XP
St Clair Shores, MI

KWKloeber

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Re: Alarm Buzzer Chirping
« Reply #7 on: November 21, 2019, 05:27:04 PM »

but don't know exactly which wires feed the buzzer.<<<

Tom your alarm and switch on the XP is different than Ken's.  The blue harness wire from the oil switch (above/in behind the starter and exhaust manifold) triggers the alarm.  it completes a ground path to the alarm.  The wiring of behind the panel depends on (1) your panel and (2) whether you have a separate alarm or the circuit board that triggers the combined hi-temp alarm along with the low oil pressure.

-ken
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain
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