Warning Horn Activates (No Power Loss); Battery Will Not Hold Charge - Mercury 225 Pro XS User Manual

• 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.
TROUBLESHOOTING
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