Basic Description

Fig. 3 Two speed round windshield wiper motor:

Fig. 4 Compound wound round windshield wiper motor w/modified pulse system:

Fig. 5 Compound wound round winshield wiper motor w/multiplex pulse system:

Description:
The 4 or 4 1/2 inch long, round motor assembly consists of an armature, field coil and end cap assembly, and a brush plate which fits over the armature and is connected to the field coils. The motor assembly is attached to a gear box housing which also provides a mount for the washer pump. A worm gear on the armature commutator end drives the output shaft at a 90° angle through a drive gear and pawl assembly.

The gear box assembly contains a magnet switch, relay and terminal board assembly (gear box relay) which provides electrical connections and controls current flow through the motor. On standard (non-pulse) motors, Fig. 3, the two motor leads to the gear box relay are concealed and routed through a cavity in the gear housing. On pulse type motors, Figs. 4 and 5, the two motor leads to the gear box relay, and the feed wire to the pulse relay are exposed. Both standard and pulse motors used on Corvette have an additional ground lead to ground the motor housing to the wiper switch.