Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fig. 5 Multiplex pulse windshield wiper motor
The 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 gearbox 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 gearbox assembly contains a magnet switch, relay and terminal board assembly (gearbox 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 gearbox 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 gearbox relay, and the feed wire to the pulse relay are
exposed.
Fig. 3 Two speed round windshield wiper motor
