Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 49Get this manual
Reverse leadsNEGATIVE lead on POSITIVE stud and POSITIVE lead on each diode assemblyNO CONTINUITY should be observedIf continuity is observed in both lests, or NO CONTINUITY is observed in both tests, the rectifier assembly is defective and must be replacedTorque rectifier screws to 171bin (2.0 Nm) IMPORTANT: Depending on the polarityoftheohmmeter, reversed readings may be obtainedI.E- CONTINUITY is observed when the NEGATIVE lead touches the POSITIVE stud and NO CONTINUITY is observed when the POSITIVE lead touches the POSITIVE studIMPORTANT: The regulator, rectifier and brush assembly are the only components individually replaceable on this alternatorIf the rotor or stator is defective, the entire rotor, stator and housing must be replaced as an assemblyIMPORTANT: Clean anti-corrosion paint from electrical connections prior to reassemblyCoat all electrical connections with LIQUID NEOPRENE (92-25711-1)ROTOR TEST 1Inspect slip ring surface for roughness, abnormal wear andor burningIf such conditions exist, rotor is not considered serviceable and alternator should be replaced