Bad Wipers

gmcsierra93 · November 4, 2009

Since the day after i bought my 93 Sierra the wipers are all screwed up. They run all the time. The only way to shut them off is to unplug them from the wiper motor. Now would the fault to this be the wiper switch or the actual wiper motor itself? Thank you for the help.

Zembonez · November 4, 2009

I'd bet on the switch.

Spurshot · November 4, 2009

'Could be either. My 79 El Camino would do that after getting the wiper motor control circuit wet (under the hood on the motor assembly). I don't know if your truck and my El Camino share any features.

grimmysnr · November 4, 2009

Switch or stuck relay. Motor is just a motor its just is just run and run. When it receives a pos and neg signal it goes. I would trace the switch and relay and with a truck at that age its gotta be a relay. Kinda like those signal relays that get stuck when its really cold out or a starter relay that wont engage.

gmcsierra93 · November 4, 2009

79 El Camino? I have an 83 El Camino. Thank you for all the responses.

thearborbarber · November 4, 2009

There was a recall for the wiper control board on that generation trucks. It would cause the wipers to do all sorts of weird stuff.

dlewis1111 · November 4, 2009

Since the day after i bought my 93 Sierra the wipers are all screwed up. They run all the time. The only way to shut them off is to unplug them from the wiper motor. Now would the fault to this be the wiper switch or the actual wiper motor itself? Thank you for the help.

Make sure its grounded. If so, replace the wiper delay board.

Gurrzt · March 13, 2015

it is a circuit board problem.

02suburbanZ71 · March 19, 2015

Im sorry but this post made me lol

Did you fix it? If not you can just unplug the fuse

eddietorn · March 19, 2015

Yes, it looks like a switch or even a wiring issue. Unplugging the fuse might help too. Haven't heard of your case though, it's usually a non-working wiper. I suggest you have a trusted technician take a look at it.

02suburbanZ71 · March 19, 2015

Use a multimeter or a test light

dsr611 · March 19, 2015

Control board problem...my 98 did just the opposite. When it was dry, the wipers would work, but a lot of times, wouldn't work in the rain. Researched and found that there was an issue with the control board housing. IIRC, it was not completely sealed and would allow moisture into the housing causing solder joints to corrode. I pulled the housing out, resoldered the joints, and sealed with some silicone caulking/sealant and never had the problem again.