1980 Ski-Doo Shop Manual, Page 209Get this manual
SECTION 04 SUB-SECTION 03, (ELECTRIC STARTER)
SYMPTOM
Starter does not turn
CAUSE Poor contact of starter switch contact poi ntsBurnt or poor contact of solenoid switch contact discOpen circuit of solenoid switch pull-in windingOpen circuit of solenoid switch hold-in windingPoor contact of brushBurnt out commutatorCommutator mica too highShorted field coilShorted armatureWeak brush spring tensionWorn bushingsWeak batteryShorted battery cell(s)Poor contact of battery terminal(s)Open circuit between starter switch
REMEDY Repair or replace switch
Starter turns; but does not crank the engine