Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 80Get this manual
NOTE: Brushes are replaced as an assemblyInspect assembly for stuck brushes or excessive brush wearNormal exposed brush length is o156 in(4.0mm)Minimum exposed brush length is 0.059 in(1.5mm)3Remove screws securing rectifier (diode assembly) to alternator Reverse leadsNEGATIVE 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 lbin(2.0 Nm)b