1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 83Get this manual
CHARGINGSTARTING SYSTEM
Testing The RectifierRegulator (Diode Test)
IMPORTANT: When performing diode test on the rectifierregulator, use only digital meter with the capability of selecting diode inspection mode
NOTE: Due to differences in the manufacturing of ohmmeters, the internal polarity may vary from manufacture to manufactureAs result, the test readings may be direct reversal of the readings specifiedIf so, reverse the meter leads and perform the test againA slight variance from the listed specification does not necessarily indicate defective component6 AMP
GRN-WHT GRN-WHT GRN GRN RED BLK BLK
WHT-GRN GRN-WHT GRN RED RED
6 AMP RECTIFIERREGULATOR DIODE TEST DIGITAL METERRed (+) Meter Lead To: Black GreenWhite Green Red 0.30 to 0.80 0.30 to 0.80 0.65 to 2.0 GreenWhite OUCH 0.30 to 0.80