Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 114Get this manual
BPlace contact fingers of meter test cable across any two commutator bars at side of commutatorCAdjust voltage control until needle hits highest readingDTest each commutator bar with the bar next to it until all bars have checked zero reading shows an open circuit in pair of bars BrushesReplace brushes if any are half worn, damaged or cracked To replace brushesthe commutator end cap assembly must be replacedFigure 11 1Check brush spring tensionReplace springs if tension is less than (40 ounces) maximum Insulated Terminal Ground TestEquipment: Ohmmeter (R Scale) or 2938-1 Circu it Trace r1Place one tester lead on insulated terminal (outside of motor frame) 2Place second tester lead on motor frame, meter should indicate c:::::: (infinity)tester should "not" lightA meter reading or tester lighting indicates defective groundFigure 12