1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 83Get this manual
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CHARGINGSTARTING SYSTEM
Green Red OUCH or 0.30 to 0.80
Red Red OUCH OUCH
OUCHOLFull Meter Deflection 10 AMP RECTIFIERREGULATOR DIODE TESTDIGITAL METERRed (+) Met