2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 70Get this manual
ELECTRICAL BATTERY CHARGING SYSTEM
Inspection
Battery Charge Coil Output
Disconnect battery charge coil wires from rectifierConnect Peak Reading Voltmeter to battery charge coil lead wires as shown
Battery Charge Coil Resistance
Disconnect battery charge coil wires from rectifierConnect Ohmmeter test probes to battery charge coil lead wires as shown
Tester probe connection C) (Red) (Black) Yellow Red