SERVICE MANUAL PROBLEM PROBABLE CAUSE SOLUTION Wiper Operates At One Speed 1. Cable harness connected 1. Replace the parking switch Only incorrectly to parking switch assembly. or resistor open. 2. Faulty manual switch. 2. Replace switch. Burnt Armature Windings, 1. Electrical overload caused by a 1. Eliminate overload Field Coils, and Brush shorted or grounded armature, condition.  Replace brush Holder Insulation Plate, or shorts or grounds in the field circuit springs, brushes and Annealed Brush Springs at points other than the ground damaged or faulty parts connection or a binding Check overload protection condition in the wiper arm shaft switch.  Warn operator to assemblies, connecting turn switch to "OFF" position links, gear and shaft whenever an overload . assembly or armature Condition is indicated 2. Operator turning wiper on 2. Caution operator. when blades are frozen to the windshield or manually stopping the blades when the wiper is operating. Burnt Armature Commutator 1. Dirt, grease or oil in 1. Clean and dress commutator. Commutator. Replace brushes and springs. 2. Open circuit in armature. 2. Replace armature, brushes and springs.  Check overload switch. Wiper Motor Speed Exces- 1. Broken field coil ground 1. Clean coil lead and spot weld sive Under Light Load But connection. it to housing or solder a Motor Stalls Under Heavy terminal to the lead, drill a small Load hole in the housing and rivet the terminal to the housing. Wiper Motor Noisy 1. Dirty or rough armature 1. Clean and dress commutator. commutator. 2. Improperly seated brushes. 2. Correct. 3. Excessive armature end 3. Readjust. play. 4. Lack of lubrication. 4. Relubricate. 5. Loose pole shoes. 5. Replace motor housing. CTS-4056-Chapter II PRINTED IN UNITED STATES OF AMERICA Page 7