Wiper motor or switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

avejoe · 11-11-2004, 02:51 PM

The other day after driving to work in the rain, my wipers would not turn off when I turned the switch all the way to the right. I turned the ign. off, restarted and the wipers turned off but the did not stop all the way at the bottom of the stroke they were (close to the bottom). After driving to work today, they stop even further away from the bottom of the stroke (but they stop)

Does this sound like a motor or switch issue?

Thanks!

Lgriffin · 11-11-2004, 05:24 PM

Sounds like the wiper motor, actually there is a set of points in the gear housing of the motor. A cam (cog, what ever) on the large gear that the wiper assembly is attached to comes around and opens the points to break the circuit. Just so happens that it does this when the wipers are down. I haven't figured out the whole circuit yet, but I do have a wiper motor here in front of me that tells me that much.
Larry
68 C20 327/465 daily driver 4:56 och!
63 C20 292/420 Camper truck Detroit Locker 4:10 posi
65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflash

tom hand · 11-11-2004, 07:00 PM

It is the park circuit in the wiper motor. One wire that goes to the motor is hot any time the key is on....when you cut the switch off, the wipers continue to run until they "park" at the bottom of the windshield

Lgriffin · 11-11-2004, 07:23 PM

Tom, I got that. Now the points are there to break the circuit to ground right? There is a resistor by the points, I assume that is for the second speed, and a terminal on each side of the resistor. There are two connections on the third terminal inside the motor. One of the connetions goes to the switch and the other is hot, must be?? Then each side of the resistor goes to the switch for your 2 speeds? I should probably have crawled onder my dash and check, but it raining.
Larry
68 C20 327/465 daily driver 4:56 och!
63 C20 292/420 Camper truck Detroit Locker 4:10 posi
65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflash

11-11-2004, 02:51 PM	#1
avejoe Custer had a plan too. Join Date: Dec 2003 Location: No. California Posts: 344	Wiper motor or switch The other day after driving to work in the rain, my wipers would not turn off when I turned the switch all the way to the right. I turned the ign. off, restarted and the wipers turned off but the did not stop all the way at the bottom of the stroke they were (close to the bottom). After driving to work today, they stop even further away from the bottom of the stroke (but they stop) Does this sound like a motor or switch issue? Thanks! __________________ 72 K15 GMC (aka Big White) Performance Rockers, Cab Corners, and Floors Fossil Fuel Glutton Neighborhood Nuisance 98 BMW 540i for Speed (Sold ) 05 Subaru Outback for mileage

11-11-2004, 07:00 PM	#3
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	It is the park circuit in the wiper motor. One wire that goes to the motor is hot any time the key is on....when you cut the switch off, the wipers continue to run until they "park" at the bottom of the windshield __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

11-11-2004, 05:24 PM	#2
Lgriffin Registered User Join Date: Jan 2004 Location: Oakdale, CA Posts: 101	Sounds like the wiper motor, actually there is a set of points in the gear housing of the motor. A cam (cog, what ever) on the large gear that the wiper assembly is attached to comes around and opens the points to break the circuit. Just so happens that it does this when the wipers are down. I haven't figured out the whole circuit yet, but I do have a wiper motor here in front of me that tells me that much. Larry 68 C20 327/465 daily driver 4:56 och! 63 C20 292/420 Camper truck Detroit Locker 4:10 posi 65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflash

11-11-2004, 07:23 PM	#4
Lgriffin Registered User Join Date: Jan 2004 Location: Oakdale, CA Posts: 101	Tom, I got that. Now the points are there to break the circuit to ground right? There is a resistor by the points, I assume that is for the second speed, and a terminal on each side of the resistor. There are two connections on the third terminal inside the motor. One of the connetions goes to the switch and the other is hot, must be?? Then each side of the resistor goes to the switch for your 2 speeds? I should probably have crawled onder my dash and check, but it raining. Larry 68 C20 327/465 daily driver 4:56 och! 63 C20 292/420 Camper truck Detroit Locker 4:10 posi 65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflash



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