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Mercury 300XS OptiMax - Warning Horn Activates (no Power Loss); Battery will Not Hold Charge

Mercury 300XS OptiMax
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TROUBLESHOOTING
94
Throttle position sensor failure.
Continuous horn sound:
The oil level in the engine-mounted oil reservoir tank is
critically low. Refill the reservoir tank and the remote oil
tank. Refer to Fuel and Oil for details.
The oil pump has failed, halting the oil supply to the engine.
Engine speed exceeds the maximum-allowable RPM. The
system limits the engine to within the allowable range. If the
overspeed condition continues, Guardian places the
engine into power reduction. Overspeed may be caused by
incorrect propeller pitch, engine height, trim angle, etc.
High engine temperature or low block water pressure.
Cooling system clogged.
Incorrect transom height (water pickups not getting
adequate water supply).
Warning Horn Activates (No Power Loss)
POSSIBLE CAUSES
Warning horn activates on start up. This is normal operation.
Water is detected in the water-separating fuel filter. Refer to
Maintenance for procedures on removing water from the
filter.
Battery Will Not Hold Charge
POSSIBLE CAUSES
Battery connections are loose or corroded.
Low electrolyte level in battery.
Worn out or inefficient battery.
Excessive use of electrical accessories.
Defective rectifier, alternator, or voltage regulator.

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