Hi all.
My wifes 98 Astro van, with 190K miles on it is having a wiper motor problem.
Earlier this spring the wiper motor went out, so I replace it no problem.
And things were fine until about 2 weeks ago, I went to take it to pick up some thing from Menards, and the wipers were on.
So I went to turn them off, only the switch on the turn signal lever was already off!
Thats odd I thought! So I turned the switch on, and the wipers did their normal thing, so I turned the switch off, yet they continued to run.
I turned the van off, and back on, and the wipers kept running.

Well OK, I thought, I got out, and unplugged the connection the wiper motor.
I didnt want to be driving around on a sunny day with the wipers going all day, a good way to burn out the new motor.

My questions is...
I think its an electrical problem in the turn signal indicator stalk/cluster.
Am I on the right track?
How do I take it out, and check/test it?
The manual I have has no information on getting that taken out.
Do I have to but and replace the entire indicator cluster?
Or is there a single part I can buy and replace once I get it out?
Also, how expensive is this fix gonna be, any ballpark ideas?

Thanks
Scott

Check the pulse board that attaches to the wiper motor. http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Wiper-Motor-Pulse-Board-Module-Motormite_5910000-P_2040_R%7CGRPWIPEAMS_837588189___ The printed circuit board connections crack and can cause the motor to malfunction.

The pulse curcuit boards are garbage... I know many people who have had their wipers go nutso and the pulse bosrd was the problem. My 96 astro had the wipers acting up and I replaced it and they work fine now. Alot of parts stores (including the dealer) want alot of $$$ for the pulse boards, but autozone had them for $29. It only takes about 5-10 mins to replace it...

Update.....
It must have been the pulse circuit board.
I swapped it out about a month ago, and it seems to be working fine.

Thanks to Old_Master and aartod for the solution!
Thanks Guys!

Glad it's working for you, and thanks for posting back with the fix.