[C320-list] Audible Alarm on Instument Panel

[John Van Vessem]

Scott,
   
  Thank you for the great information.  Sounds like I need a new buzzer, do you know where I can get one?

"T. Scott Thompson" <sthompson at toad.net> wrote:
  John: Two thoughts: First, there are "idiot lights" on the instrument 
pod for oil pressure. If the idiot light for oil pressure comes on when 
you activate ignition (but without starting the engine) then the problem 
is in your buzzer, since they are wired in parallel. If the idiot light 
does not come on then you may have a problem with the oil pressure 
sensor, or it could be elsewhere. You can test the sensor by shorting 
out its lead to the engine block. If the idiot light or buzzer come on 
only when you do this then the sensor is bad. Otherwise the fault is 
elsewhere.

Testing the temp alarm sensor isn't quite so easy since it's not 
supposed to go on at all unless you are over temp. You can, however, 
test the panel circuitry for this alarm by shorting out the sensor on 
the engine block. That should set off the alarm.

These comments are based on the Yanmar design. The Yanmar sensors 
activate by creating a connection between their input lead and the 
engine block. The instrument panel alarms are fed with +12 by the 
ignition switch, and completing their ground through the engine block is 
what sets them off. Given this design, the oil pressure alarm is 
supposed to go off if the engine isn't running but the ignition switch 
is on.

By the way, you can trace this fairly easy by looking at the engine 
panel wiring diagram in your manual.

Scott Thompson
Surprise, 653

John Van Vessem wrote:
> I'm going to try to fix the alarm on my instrument panel today, it doesn't work. Can anyone give me some advice as to whether the problem is the horn itself or the sending device. Is the sending device on the engine? If its the horn itself where can I get one?
> 
> John (Sojourn 645)
>
>
> John Van Vessem
> Sojourn 645
> Vallejo Yacht Club
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John Van Vessem
Sojourn 645
Vallejo Yacht Club