windshield wiper repair

[NCali]

I have a 1987 2wd 1/2 ton with the pulse wiper system. switch on the column washer motor behind the tank. Problem is the wipers wont shut off. At times I can get  them to stop by twisting the switch back and forth.  My motor has 2 connectors, one for  the motor and one for the park position. with the connector pulled out of the park position, I checked the contacts with an ohm  meter and the contact is open.  with the key on I have 12 volts on the white wire of the park connector and 12 volts on all three wires going to the motor. the wipers have the low, high and intermittent functions when selected on the switch
thank you for any assistance, btw I have read your wiper section and ended up confused

[VileZambonie]

Start by following the attached instructions.

[NCali]

VileZambonie : thank you for the assistance with my wipers. I installed a new motor and that fixed it. sure saved me alot of time  and money not throwing parts at it

[VileZambonie]

Glad to hear 

[NCali]

To continue:  installed brand new wiper motor with new bushings and the old solid ground strap (cleaned up) on 3 October . It is now
the 7th of October , driving down the road, the wiper switch on the turn signal stalk in the off position, The wipers begin to cycle on  the low speed  delay. I can shut them off and the wipers w ill park. The wiper system is simple on this truck with only the switch stalk and the delay module in the circuit or a better ground
1987 1/2 ton 2wd 305 tbi

[bd]

How did you shut the wipers off the first time the symptoms occurred?  Is the problem recurring or was it a one-time occurrence?  If it keeps manifesting, remove the pulse module from the circuit and plug the switch harness directly into the dash harness.  That will eliminate the module as a variable.

[NCali]

(I put the link here instead of the copy/paste, and this is a continuation I am move this post to that same one. -Captkaos)
I wrote the following thread some tine ago.  http://forum.73-87chevytrucks.com/smforum/index.php?topic=39789


then I changed the switch and the wiper motor and that fixed thee problem until now. Driving down the road the wipers came on and would not shut off. To get home I unplugged wires 17, 18 and 19, 3 and 4. today I plugged those wires back in and the delay module instantly got hot. unplugged the delay module and tried to put the connectors together but the wipers didn't run. with the switch in the off position I no have power on #4 , 17,18 and 19. my next step will be to separate the delay module to see if I can find a short
 or another delay module
any thoughts?

[zucchi]

Since the wipers operate by manipulating ground rather than power, I suspect this is a grounding issue. I would reestablish the ground and/or add a redundant ground strap for the wiper switch.