1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 81Get this manual
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CHARGINGSTARTING SYSTEM
RPM Amp Charging Coil 1000 2000 3000 4000 5000
AMPERES 2.0 4.1 5.0 5.3 5.5
4 If proper ampere readings are not obtained, replace battery