1968 Evinrude Starflite 100 HP outboards Service Manual, Page 14Get this manual
TROUBLE CHECK CHART (CONT) TROUBLE 7STARTER MOTOR WILL NOT OPERATE POSSIBLE CAUSE ASTARTING CIRCUITSee Section Loose or corroded battery connections Safety switch inoperative (loose) Throttle advanced too far Poor or broken battery connections Weak or shorted battery Defective key or starter switch Jammed starter drive Damaged starter drive parts Worn brushes Broken brush spring Open circuit in solenoid Burned commutator Broken field terminal Shorted or open windingsarmature or field Ammeter to key switch fuse blown BEXCESSIVE STARTER CURRENT DRAWSee Section Worn or dry armature shaft bearings Excessive friction in engine Brushes not seating Dirty or corroded commutator Loose pole pieces Shorted armature or field Bearing heads buckled