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

MAINTENANCE
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3. Remove the vent plug (upper plug) and sealing ring.
4. Remove the fill/drain plug (lower plug) and sealing ring and
drain lubricant.
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 710 ml (24 oz).