Where's the buzzer?

[Peregrine]

I recently posted a query about replacing a tachometer on a 9 year old Aqualine with an Isuzu 42 engine. Many thanks to those who responded, especially Tony Brooks.

 

At the same time that the tachometer failed, the ignition warning buzzer malfunctioned, but while Oxley Marine were looking at these control panel problems, it seemed to recover, so I didn't mention it. Since then it has stopped working again at start, but sometimes sounds during the stop procedure, as it should. I would like to fix this – it feels like a dodgy connection, but obviously may be a faulty device.

 

However, I can't find any mention of the buzzer in the manual. It's not on the very clear Isuzu wiring diagram. So I don't know whether it's a separate device, or whether it's part of one of the other instruments on the control panel. I would like to be clear what I'm looking for before I dismantle the control panel again.

 

Does anyone know, please [a] where the buzzer is located; where it fits in the wiring scheme?

 

 

[Tiggs]

The buzzer is usually located behind the control panel. If it is not you need to make it sound and find it by listening. Usually a round thing about the size of a tea light candle. If there is a light that comes on at the same time as the buzzer then it may be simply connected across that light.

 

http://www.barrus.co.uk/media/1348/rdg603a8-issue-1-shire-14-canal-boat-complete-manual-30-35-38-40-45-50.pdf

contains a typical panel mounted buzzer connection diagram where the buzzer can sound for 3 possible reasons low oil pressure, high water temperature or alternator failure - connection is via 3 diodes to the engine sensors. Some boats are this complex, some are not.

Edited September 20, 2016 by Tiggs

[Peregrine]

The buzzer is usually located behind the control panel. … If there is a light that comes on at the same time as the buzzer then it may be simply connected across that light.

 

http://www.barrus.co.uk/media/1348/rdg603a8-issue-1-shire-14-canal-boat-complete-manual-30-35-38-40-45-50.pdf

contains a typical panel mounted buzzer connection diagram

 

 

That's useful, Tiggs. Thank you.

[ditchcrawler]

The buzzer is usually located behind the control panel. If it is not you need to make it sound and find it by listening. Usually a round thing about the size of a tea light candle. If there is a light that comes on at the same time as the buzzer then it may be simply connected across that light.

 

http://www.barrus.co.uk/media/1348/rdg603a8-issue-1-shire-14-canal-boat-complete-manual-30-35-38-40-45-50.pdf

contains a typical panel mounted buzzer connection diagram where the buzzer can sound for 3 possible reasons low oil pressure, high water temperature or alternator failure - connection is via 3 diodes to the engine sensors. Some boats are this complex, some are not.

That also sounds like the Beta one, I think I have a diode gone but I am not going to pull it to bits to see, I will just add it to the round touit list.

[IDS]

As others have said it's probably a bad connection on the back of the panel, wiggle the wires and diodes that go to it and you should find the bad connection(s). As it doesn't sound for either oil or alternator when you start the bad connection is likely to be the common +12v line from the panel to the sounder. Replacements are cheap however Maplin have plenty to choose from.