1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 20Get this manual
TROUBLE CHECK CHART (CONT) TROUBLE 6SHIFT WILL NOT OPERATE POSSIBLE CAUSE ACONTROL BOX AND CABLE CONNECTIONSSee Section Control box andor power head connectionsBLOWER UNITSee Section Incorrect lubricant (OMC HI VIS Gearcase Lube only) Oil pump screen plugged Shift rod connector misadjusted Damaged shift assist cylinder Oil pump wornlow oil level Shifter dog or spring damaged AALTERNATOR SYSTEMSee Section Faulty wiring Rectifier diodes damaged Shorted or open stator windings ASTARTING CIRCUITSee Section Weak or shorted battery Loose or corroded battery connections Gear shift not in neutral Defective neutral start switch Defective key switch Jammed starter drive Damaged starter drive parts Wrong rotation (Bosch) brushes in wrong Worn brushes (stuck brush) Broken brush springs Open circuit in solenoid Burned commutator Broken field terminal Shorted or open windingsarmature or field 20 AMPFuse 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 Bearing heads buckled