Section 2 - Getting to Know Your Power Package
90-899883295 JUNE 2008 Page 27
6. The Quicksilver MerCathode system has a 20 amp in‑line fuse in the wire which
connects to the positive (+) terminal on controller. If the fuse is blown, the system will
not operate resulting in a loss of corrosion protection.
mc79977
Warning Horn Signals
Most faults will cause the warning horn circuit to activate. How the warning horn activates
depends on how serious the problem is. There are four warning horn states:
• Caution ‑ horn signal varies with product line and calibration. Minimal guardian.
• Warning ‑ horn signal varies with product line and calibration.
• Severe ‑ horn is beeping constantly.
• Critical ‑ horn is beeping constantly and guardian will be at forced idle.
In addition, depending on the gauge package, there will be warning icons and fault
messages on the dash mounted gauges.
Audio Warning System
IMPORTANT: The audio warning system alerts the operator that a problem has occurred.
It does not protect the engine from damage.
Your Mercury MerCruiser power package may be equipped with an audio warning system.
Most faults cause the warning horn circuit to activate. How the warning horn activates
depends on the severity of the problem.
There are three warning horn states:
• Caution
• Severe
• Onboard Diagnostic Marine (OBDM) fault
CAUTION
If a caution is detected, the audio warning system will sound for six one‑second intervals.
ON ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1
1
1
1
1
1
1
1
1
1
1
OFF
33402
a - Horn (on or off)
b - Time (in seconds)
Below are some examples of a caution fault:
• Transmission fluid temperature is too hot
• Drive oil is low
• Sensor failure
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