1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 162Get this manual
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lsi-DR2330
INotel All ohmmeter tests must be performed with engine not runningf61 1 Calibrate ohmmeter on Rx100 scale and connect between power pack end of switch harness and clean engine ground