Section 2 - Getting to Know Your Power Package
Page 38 90-864195070 JUNE 2007
7. 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
Audio Warning System
Your Mercury MerCruiser power package may be equipped with an Audio Warning System.
The Audio Warning System will not protect the engine from damage. It is designed to warn
the operator that a problem has occurred.
The audio warning system will sound with a continuous horn if one of the following occurs:
• Engine oil pressure too low
• Engine temperature too hot
• Seawater pressure too low
The audio warning system will sound with an intermittent beeping if the following occurs:
• Sterndrive oil level too low
NOTICE
A continuous horn indicates a critical fault. Operating the engine during a critical fault can
damage components. If the warning horn emits a continuous beep, do not operate the
engine unless avoiding a hazardous situation.
If the alarm sounds, stop the engine immediately. Investigate cause and correct it, if
possible. If the cause cannot be determined, contact your authorized Mercury MerCruiser
dealer.
Testing The Audio Warning System
1. Turn the ignition switch to the "ON" position without cranking the engine.
2. Listen for the audio alarm. The alarm will sound if the system is functioning correctly.
Engine Guardian Strategy
IMPORTANT: Boat speed could be reduced to idle and may not respond to the throttle.
Engine Guardian Strategy is designed to help reduce the potential for engine damage by
reducing engine power when a potential problem is sensed by the ECM. Engine Guardian
monitors:
• Oil pressure
• Coolant temperature
• Seawater pressure
• Engine overspeed
• Exhaust Manifold Temperature [8.1 liter (496 cid) engines only]
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