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Author Topic:   Garmin 178 Alarm tone volume adjustment
BellBoyBob posted 05-28-2007 05:37 PM ET (US)   Profile for BellBoyBob   Send Email to BellBoyBob  
I am trying to adjust the volume of the anchor drag alarm volume or the "off course" alarm volume. it is too quiet when I am under way and the engine is running. Any ideas?
Thanks, Bob
Bella con23 posted 05-28-2007 09:49 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
Bob, The unused yellow wire in the harness at the rear connector on the Garmin 178 is the negative conductor of the alarm output. The load is restricted to 100 milliamps. That is not suitable to be connected to a high current horn directly. I would go to an electronics supplier and ask for a 12 volt direct current piezo horn that draws less then the 100 ma rating of the Garmin 178.


As I said, connect the yellow wire of the Garmin to the negative side of the horn and the positive side of the horn to the 12 volt (red) positive wire of the Garmin itself.

Chuck Tribolet posted 05-28-2007 10:19 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
OR, wire the GPS to a relay, and have the relay trigger the
ALARM, loud enough to wake the dead (or the


Bella con23 posted 05-28-2007 10:28 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
This is true!
Three Buck Chuck on the East coast. Still another reason to move!

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