1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 57Get this manual

IGNITION
Crank Position Sensor

Contains permanent magnet and is positioned in front of the flywheelThe timed passing of the flywheel teeth through the sensor's magnetic field enables the ECM to determine engine rpm and crankshaft angle
Ignition and Battery Charging Coils

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives