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Author Topic:   Guardian System Audible Alarms
wldrns1 posted 08-06-2009 06:10 PM ET (US)   Profile for wldrns1   Send Email to wldrns1  
My boat is 2008 150 Sport with a 60 4 stroke Bigfoot. The original equipment propeller is activating the Cylinder Ignition Cutout feature when the engine exceeds 6250 rpms. The engine is indeed exceeding this speed. I went for a ride with the local dealer tech. We were verifying accuracy of my dash mounted tach to hopefully prop tune when he noted a ticking sound at WOT. I never heard it before since I've never ran it with the cowling removed. He explained the cutout feature was activating.

The service Manual states this overspeed condition will produce a continuous Audible Alarm. None is heard. I do have the system verification alarm at initial key on prior to start. I'm a little concerned the System may not be working properly. If not, what about low oil or overheat?

Is it cast in stone that an overspeed condition would produce a continuous-until-corrected alarm?

Any assistance would be greatly appreciated.

jimh posted 08-07-2009 07:21 AM ET (US)     Profile for jimh  Send Email to jimh     
To test the alarm system on a typical outboard motor, temporarily remove the lead from the temperature sensor and connect it to ground. This should cause the alarm to sound. This works on systems where the temperature sensor is a thermostatic switch that closes when the temperature limit is reached. If the system uses a more sophisticated temperature sensor, just remove the lead. That ought to trigger an alarm, too.

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