C-28 Alarm Behind Mirror in Head

[bails023]

Today when I went down to the boat (stowed on a lift), I heard a "screeching" sound. A small audible alarm device attached to the fuse panel behind the mirror in the head was the source. The alarm device has two wires, a white and a black that are connected to a red and blue wire (very small gauge) that go into a conduit labeled "Compass". I can turn the alarm off by turning the House switch off or by removing a 3A fuse on Dash Fuse Block #2 labeled "Network (optional)".

Any suggestions before I begin trying to trace the Compass conduit. It goes back behind the helm and then disappears.

 

[Brunski]

That's the autopilot alarm. The buzzer is connected to your CCU, or "Compass Ball". As to why it's going off, that I don't know. The only alarm reference I could find in the Garmin GHC 20 manual is a low voltage alarm. How are your batteries?

 

[bails023]

Thanks Brunski,

You are correct - low battery voltage and self inflicted as I forgot to turn the battery charger breaker back on after doing some AC work on the boat.

A little strange as the DC battery voltmeter on the panel showed 13.7v in all three positions ..............?

Thanks. bails023