Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 107Get this manual
CHARGINGSTARTING SYSTEM
8Place springs and brushes into brush holder and hold in place with brush retainer tool9Install commutator end cap onto starter frameAlign marks on frame with alignment marks on end capsRemove brush retainer toolInstall through bolts and torque to 70 lb-in (8 Nm)
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aBrush Retainer ToolAlignment Marks
Starter Solenoid Test
1Disconnect all wires from solenoid2Connect ohmmeter (R x1 scale) between terminals and 23Connect 12-volt power supply between terminals and 4Solenoid should click and meter should read ohms (full continuity)4If meter does not read ohms (full continuity), replace solenoid