Performance Loss; Battery Will Not Hold Charge - Mercury Racing 500R Operation And Maintenance Manual

a. Engine fuel filter is obstructed. Refer to Maintenance section.
b. Fuel tank filter obstructed.
c. Stuck anti‑siphon valve located on permanently built‑in type fuel tanks.
d. Fuel line is kinked or pinched.
• Fuel system is not primed.
• Fuel pump failure.
• Ignition system component failure.

Performance Loss

POSSIBLE CAUSES
• Overheating—warning horn not working.
• Low oil pressure. Check oil level.
• Throttle not opening fully.
• Damaged propeller or improper propeller size.
• Low water pressure.
• Low battery voltage.
• Worn, stretched or broken accessory belt.
• Boat overloaded or load improperly distributed.
• Excessive water in bilge.
• Boat bottom is dirty or damaged.
• Air filter or intake screen that is partially blocked with debris.

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.
• Open circuit in the alternator output wire (fused link).
• Worn or stretched accessory belt.
TROUBLESHOOTING
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