Tempo L4-122 2.0L DSL (1984)
Wiper Motor: Description and Operation
Windshield wipers are operated by a two speed, permanent magnet motor through a pivot link assembly. Motor speeds are determined by current flow
to a low or high speed motor brush through a dash or steering column mounted control switch. The wiper circuit is protected by a circuit breaker which is
integral with dash mounted rotary switches, or is located in the fuse block on models with slide type or column mounted switches. An intermittent
governor and a wiper switch with a variable resistor are used to provide a delay wipe mode on some models.
Four different wiper motors are used, depending upon application. There are two non-depressed park type motors and two depressed park type motors.
All motors function in a similar manner electrically, but there are differences in motor alignment and park switch location, and differences in the output
arm mechanism between depressed park and non-depressed park motors.
The motor used on all models with non-depressed park wipers, except Tempo and Topaz, has a worm gear on the armature shaft to drive the output
arm at a 90° angle. On Tempo and Topaz, the armature is parallel to the output shaft. Both motors have a park switch mounted in the brush holder which
allows wipers to run to their lowest point of travel and stop when the wiper switch is placed in off position.
On models with depressed park wipers, except 1982---87 Lincoln Continental, 1983---87 Cougar, Thunderbird and 1984---87 Mark VII, the wiper
motor has a brush plate at one end, a gear box assembly and park switch at the other end, and the armature drives the output shaft at a 90° angle. The
wiper motor used on 1982---87 Lincoln Continental, 1983---87 Cougar, Thunderbird and 1984---87 Mark VII, has the brush plate and park switch
assembly at the gear box end, and the armature is parallel to the output shaft. On both depressed park type motors, a latch and cam assembly on the
output arm and special circuitry allows wipers to park below their normal travel when the switch is in off position.
