2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 88Get this manual
ELECTRICAL CHARGING SYSTEM TESTS To check stator for grounded condition, connect one meter lead to clean engine ground and the other lead alternately to the yellowblue, yellow and yellowgray stator leads: Ohmmeter should show high reading If ohmmeter shows low reading, stator is groundedIf stator lead is grounded, repair it or replace the stator assembly
Rectifier Resistance Tests
Disconnect battery cables at the battery
STEP Disconnect all rectifier leads from terminal boardCalibrate ohmmeter on appropriate scaleConnect one lead to clean engine groundConnect the other lead to the rectifier yellowgray leadNote the readingReverse the ohmmeter connections or press the "reverse polarity" button and note the readingPerform the same procedure on the yellow and yellowblue rectifier leadsNote the readings high reading in one direction and low reading in the other direction indicates the diode is OK Two high readings or two low readings indicate the diode is damaged