The park switch is in the wiper motor.
If no one here has one then try your local auto parts stores for a rebuilt or www.car-part.com
for a used one.
Motor Will Not Operate In Any Switch Position
1. Place wiper switch in low position and listen to hear if motor is running.
2. If motor is running, but output shaft is not rotating, motor is defective. If drive shaft is turning, check drive link to output shaft or linkage for proper connection.
3. Check wiper system fuse on 1983-87 front wheel drive models and Dakota, and replace if necessary. If fuse blows again, proceed to step 7. If fuse does not blow, continue with next step.
4. Connect voltmeter between wiper motor terminal L and ground, leaving electrical connector in place. On all except 1983-87 front wheel drive models and Dakota, observe meter for several minutes to check circuit breaker. If circuit breaker is cycling, proceed to step 7.
5. If meter indicates approximately 12 volts, the motor is defective.
6. If voltmeter indicates no voltage at motor terminal L, and fuse or circuit breaker is satisfactory, check continuity of wiper system wiring and wiper switch. Repair wiring or replace switch as needed.
7. If wiper system fuse is blown on 1983-87 front wheel drive models and 1987 Dakota, or if circuit breaker is cycling on all other models, disconnect electrical connector to wiper motor. On 1983-87 front wheel drive models and 1987 Dakota , install a suitable test circuit breaker across wiper system fuse terminals.
8. Check voltage at terminal L in electrical connector to wiper motor.
9. If circuit breaker continues to cycle, check for short circuit in wiper system wiring or defective switch.
10. If meter indicates approximately 12 volts in step 8, and circuit breaker does not cycle, check motor as follows:
a. Remove wiper arm assemblies.
b. Connect positive lead of ammeter to battery positive post, and connect negative lead to motor terminal L.
c. If motor operates and draws less than 6 amps, motor is satisfactory, recheck switch, wiring and circuit breaker.
d. If motor does not operate, or operates but draws more than 6 amps, disconnect ammeter and remove crank arm retainer and arm from motor.
e. Repeat step b. If motor operates and draws 3 amps or less, repair wiper linkage. If motor does not operate, or operates but draws more then 3 amps, motor is defective.
Motor Operates At Either High Or Low Speed Only
1. If motor operates at low speed, place wiper switch in high position and connect test lamp between motor terminal H and ground. If motor operates at high speed, place wiper switch in low position and connect test lamp between motor terminal L and ground. Leave electrical connector connected to motor.
2. If test lamp does not light at motor terminal, there is an open circuit in wiper switch or wiring. If test lamp lights at motor terminal, motor is defective.
Wiper Motor Will Continue To Operate With Switch In Off Position
1. Remove wire connector and connect jumper wire from motor terminal L to terminal P2. Connect a second jumper wire from terminal P1 to battery. If motor runs to park position and stops, wiper switch is defective. If motor continues to operate and does not park, motor is defective.
Wipers Do Not Return To Park Position
1. Remove wiper motor wire connector and clean terminals.
2. Place wiper switch in park position.
3. Connect a voltmeter between terminals P1 and L. If a reading of 12 volts is obtained at terminal P1, check voltage at terminal P2. If voltage at terminal P2 is zero, motor is defective. If there is 12 volts at terminal P2, there is an open circuit in wiper switch or wiring.