Parking Switch Contact Point Adjustment
This illustration is typical of most wiper motor park switch adjustments. Although your Ford Shop Manual gets into an involved dissertation about how to properly adjust the park switch, it is a simple process. You want this switch open with the wiper motor at park. The adjustment screw moves the lower contact closer or further from the bridge (upper) contact. Clockwise adjustment moves the lower contact closer to the bridge. Counterclockwise moves it away from the bridge.
When the wiper motor is in operation, these contacts open and close as the gear reduction package rotates. Because the wiper switch is in the on position, contact to ground is maintained and the motor continues to run. When the wiper switch is turned off, we lose our primary ground, which leaves the park switch ground intact. The motor continues to run until the park switch ground is broken. Your goal is to have the contacts open when the wiper motor is in the parked position.
13 With the wiper motor parts...
13 With the wiper motor parts cleaned and inspected, they are now ready for assembly. Ray has dressed the armature slippers and checked the armature for good continuity. Gears and shafts have been cleaned, dressed, and inspected.
14 Ray has dressed the wiper...
14 Ray has dressed the wiper motor output shaft and gear with windshield wiper gear drive lubricant. This lubricant is free flowing, yet sticks to everything to ensure adequate lubrication.
15 Park switch link and nylon...
15 Park switch link and nylon shaft are installed. The park switch cam moves this link and opens the park switch, halting wiper operation at the base of your Mustang’s windshield.
16 After installing the output...
16 After installing the output shaft gear, the nylon idler gear can be installed. It consists of a large nylon gear mated to a smaller steel gear, which is how motor speed is reduced and torque multiplied at the same time.
17 New brushes and springs...
17 New brushes and springs have been installed and are held in position with a special tool that Ray fabricated for this process. One brush is positive, getting its power from the plug, while the other is negative ground to the case.
18 Ray installs the armature...
18 Ray installs the armature after applying wiper motor grease to the shaft and bushings. Once the armature is in place, Ray removes the brush-retaining tool. Brush and slipper surfaces must be hospital clean.
19 Ray assembles the motor...
19 Ray assembles the motor and gear cases. The trick here is those permanent magnets, which want to grab the armature.
20 The reduction gearbox...
20 The reduction gearbox is packed with plenty of wiper motor lube for smooth operation. If you can’t get the wiper motor lube, opt for wheel bearing grease and make sure it touches everything.
21 Our completed one-speed...
21 Our completed one-speed wiper motor has been tested and is ready for service. All this one needed was new brushes and armature service.