Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 90Get this manual
CHARGINGSTARTING SYSTEM
NOTE: To test rectifier assembly, touch POSITIVE (+) lead from ohmmeter to POSITIVE stud and NEGATIVE () lead from ohmmeter to each diode terminalThe ohmmeter should indicate continuity
aPositive StudPositive Ohm LeadNegative Ohm Lead Reverse leads NEGATIVE lead on POSITIVE stud and POSITIVE lead on each diode assemblyNO CONTINUITY should be observedIf continuity is observed in both tests, or NO CONTINUITY is observed in both tests, the rectifier assembly is defective and must be replacedTorque rectifier screws to 17 lb-in (1.9 Nm)