Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 91Get this manual
CHARGINGSTARTING SYSTEM
IMPORTANT: 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 replaced2Measure the outer diameter of the slip rings using vernier calipersSTANDARD DIAMETER: 0.567 in(14.4 mm); MINIMUM DIAMETER: 0.551 in(14 mm)If slip ring diameter is less than minimum, rotor is not considered serviceable and alternator should be replaced