Wipers have mind of their own

[pokerdave]

I have a 1990 GMC sierra 1500. The wipers come on when I need them to but for some reason they dont always shut off. I find it happens more often when there is only a fine mist. I will put them on delay and it switches to low speed on its own and even keeps running when I try and shut them off. What should I try first? Is it something I should just take it to the dealer for (Recall maybe that I didnt know about?)
Thanks, Dave.

[2000CAYukon]

When this happened on my 90 K1500, I took the circuit board out, cleaned the connections really good, used some dielectric grease on them, put it back together and I never had the problem again. That was a couple of years ago.

The circuit boards do go bad. No recall that I know about (original owner on my 90). Try cleaning the connectors first and go from there.

//2000CAYukon

[p0peye_34]

There's a recall on certain models. Stop by the dealer and see if yours is one.

[horse482]

I have a '94 that had the same problem, went to the local auto parts and bought a new board, that fixed the problem. They are under $40 now.

[brcidd]

I just re-heat the solder joints on the circuit board--that usually last about 4 years each time- but the price is right!

[jen6238]

when this happened on the 1994 SLT sierra and the 2000 SLT sierra (crew) and the 2002 SLT sierra we replaced the little circuit board inside the wiper motor

[wolfden6]

I was wondering.....My wipers are doing the same thing and also the washer motor is not working when applied....Could a bad pulse board module also affect the washer motor operation ??

Thanks

[87racer]

another quick fix is to install a short ground wire from wiper motor to firewall . i think the board loses a ground. mine has worked for about 8 years now