Electra Estate Wagon V8-350 5.7L DSL VIN N FI (1984)
Wiper Motor: Description and Operation
Standard Non-Pulse Wiper
Fig. 3 Two speed round windshield wiper motor
Fig. 6 Gear box relay and drive gear assembly, shown out of park position. Compound wound round windshield wiper motor
Fig. 7 Gear box relay and drive gear assembly, shown in park position. Compound wound round windshield wiper motor
Operation:
When ignition is on, battery voltage is supplied to gear box relay terminal 2, Fig. 3. When terminal 1 is grounded, relay contacts close and current is
supplied to the motor. Current flows through the series field to a splice where it is divided, and part passes through the armature to the motor housing
ground, and part through the shunt field. Motor speeds are determined by the amount of current flowing through the shunt field.
Placing wiper switch in low position grounds gear box relay terminals 1 and 3. The relay contacts close, shunt field current flows directly to ground at
