DESCRIPTION
Two-speed permanent magnet windshield wiper motor is used. The 2-speed motor uses a 3-brush plate and switch assembly. Motor is operated at low speed (control selector is in low position) by grounded brush and White wire brush.
To operate motor at high speed, (control selector in high position), grounded brush and Blue wire brush are used to operate motor at high speed. When control selector is moved to park position, motor will continue at low speed until park switch lower contacts open, stopping motor in park position.
Optional interval wipers are available on all models. Intermittent operation is controlled by a variable resistor in the windshield wiper control switch, which combined with electronic governor, allows a variable pause between wiping cycles.
For normal operation, turn wiper control knob clockwise for low or high speed. For intermittent operation, rotate wiper control knob to left. The more the knob is rotated to left the greater the time interval between wiper blade sweeps.
Electric windshield washer system consists of an instrument panel control switch incorporated into wiper switch, a reservoir and motor assembly, nozzles and connecting hoses.
WIPER MOTOR CURRENT DRAW
- Disconnect linkage and electrical connections from motor. Connect Green lead of volt-amp meter to battery positive post, and positive (Red) lead of meter to low speed connection at electrical plug. Measure and record current draw.
- Move positive (Red) lead of meter to high speed connection at electrical plug. Check and record current draw. Maximum allowable current draw for either speed is 3.0-amps. If current draw exceeds maximum, check output arm and windlatch mechanism for binding or damage before replacing motor. (Scheme 2)
Wiring Diagram 2-Speed Non-Interval Wipers. Scheme 1
Motor Current Draw Test. Scheme 2
CIRCUIT BREAKER
Circuit breaker is located in wiper control switch on all rotary switches and in fuse panel for slide wiper control switches. On models with the circuit breaker located in the fuse panel, the rating is 7.5 amps. The circuit breaker integral with the switch is rated at 7 amps. The following test does not apply to vehicles with the circuit breaker located in the fuse panel.
- Before connecting tester leads as shown in Fig. (Scheme 3), short tester leads together and adjust current draw to 7-amps. Connect leads to switch. Leave leads attached for 10 minutes.
- Current should not be broken during 10 minute test period. If current is broken during test, replace wiper switch assembly. Short tester leads together and adjust current draw until it is twice rated current.
- Connect leads to switch. Current should fall to 0 within 20 seconds. If current has not broken within 20 seconds, remove leads from switch and replace wiper switch assembly.
Circuit Breaker Test Does not apply to fuse-panel mounted circuit breaker. Scheme 3
WIPER SWITCH CONTINUITY TEST
- Use appropriate SWITCH CONTINUITY table and corresponding figure to check continuity between switch terminals. See illustrations. Either a self-powered test light or an ohmmeter can be used to test a standard 2-speed switch. Only an ohmmeter can be used to test switch on intermittent-type system.
- If switch does meet continuity specifications, replace switch. To detect marginal switch operation, slide switch (or rotate knob) while obtaining readings.
Blade-Type Switch Connector. Scheme 4
| Switch Position | Terminals |
|---|---|
| Off (Park) | C-D, A-B |
| Low | A-B-C |
| High | A-B-E |
| Wash | A-B-W1 |
| Intermittent | Intermittent |
| Switch Position | Terminals |
| Off (Park) | A-B, D-E |
| Low | (1) A-B, D-E-F |
| High | (1) D-E-F, A-B-C |
| Intermittent | E-F, A-B |
| Wash | A-B-W1 |
| (1) Variable resistance between terminals D and E should be a minimum of 200-1000 ohms and a maximum of 5600-8400 ohms. | |
| (1) | Variable resistance between terminals D and E should be a minimum of 200-1000 ohms and a maximum of 5600-8400 ohms. |
ROUND BLADE-TYPE SWITCH CONTINUITY
Blade-Type (Slide Switch) Connector Non-Interval Type. Scheme 5
| Switch Position (Non-Interval) | Terminals |
|---|---|
| Off (Park) | 1-5, 3-7 |
| Low | 1-4, 2-7 |
| High | 1-4, 2-6 |
| Wash | W1-W2 |
SLIDING-TYPE (NON-INTERVAL) SWITCH CONTINUITY
Blade-Type (Slide Switch) Connector Interval-Type. Scheme 6
| Switch Position (Interval) | Terminals |
|---|---|
| Off (Park) | A-E |
| Low (1) | B-E-F-C |
| High | D-B-F-C |
| Intermittent | B-E-F |
| Wash | W1-W2 |
| (1) Resistance between terminals F and C will vary from 100-900 ohms at minimum dwell to 8000-12,000 ohms at maximum dwell. | |
| (1) | Resistance between terminals F and C will vary from 100-900 ohms at minimum dwell to 8000-12,000 ohms at maximum dwell. |
SLIDING-TYPE (INTERVAL) SWITCH CONTINUITY
INTERMITTENT GOVERNOR
If intermittent operation is unsatisfactory, check motor current draw, then check control switch and appropriate wiring. If motor, switch and wiring check out okay, replace electronic governor assembly.
Wiring Diagram 2-Speed Interval. Scheme 7
WASHER PUMP CURRENT DRAW
Connect ammeter leads. (Scheme 8) Operate washer pump. Acceptable current draw is 1.7 through 4-amps during washer pump operation.
Washer Pump Current Draw Test. Scheme 8
WIPER MOTOR
- Disconnect battery negative cable. Remove wiper arms and blade assemblies. Remove cowl grille attaching screws and raise cowl. Disconnect washer hose and remove cowl grille.
- Remove wiper linkage clips from motor output arm. Disconnect wiring. Remove motor attaching screws and motor. To install, reverse removal procedure.
Removal & Installation
Disconnect battery negative cable. Remove switch knob, bezel nut and bezel. Pull switch out from under instrument panel. Disconnect electrical connection from switch. Remove switch from vehicle. To install, reverse removal procedure.
Governor is mounted on lower flange of instrument panel. Remove rear window defogger switch assembly (if equipped) to gain access to right side governor attaching screw. Disconnect wiring from governor, remove attaching screws, and remove governor. To install, reverse removal procedure.
- Using a small screwdriver, disconnect lock tab wire connector. Remove hose and drain reservoir. Remove pump retaining screws. Lift motor from vehicle.
- With reservoir drained, remove reservoir attaching screws, and remove reservoir. To install, reverse removal procedure. Fill reservoir before electrical connections are made.
Note. Wiper motor for "F" series and Bronco is not serviceable, and must be replaced as a unit.
Disassembly and Reassembly
Remove 4 cover retaining screws. Remove assembly. Replace with appropriate kit. Ensure ground strap is under cover screw. Tighten screws to 15-25 INCH lbs. (1.7-2.8 N.m).
Disassembly
Remove reservoir assembly from vehicle. Pry out retaining ring with a small screwdriver. Using pliers, grip one part of wall surrounding electrical terminal and pull out motor, seal and impeller assembly.
Reassembly
Lubricate outside of new seal with powdered graphite. Ensure reservoir chamber is clean. Align small tab on pump end cap with slot in reservoir so seal seats tightly against bottom of pump cavity. To complete reassembly, reverse disassembly procedure.