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Wipers won't work
Thread Starter
Instructor
Joined: Feb 2003
Posts: 164
Likes: 1
From: Houston Texas
Wipers won't work
Now that the vacuum controlled wiper door works fine (after replacing a defective vacuum relay), I can't get the wipers to work anymore. I checked the fuse: It's fine. I can only get the wipers to move (just a little) when I push on the switch on the dashboard (as if asking for windshield wash): They move a couple inches out of their lodging and back, although not fully. However, I can't get them to work either in low or high speed.
That's weird because they were working fine before I replaced the vacuum relay (except that the wiper door would stay open all the time). And when I tested again after replacing the relay, they worked once, only once, and stopped for good. Again, the fuse is good.
Any hint is welcome.
That's weird because they were working fine before I replaced the vacuum relay (except that the wiper door would stay open all the time). And when I tested again after replacing the relay, they worked once, only once, and stopped for good. Again, the fuse is good.
Any hint is welcome.
Team Owner
Joined: Jul 2006
Posts: 22,192
Likes: 4,180
From: Kannapolis NC
Now that the vacuum controlled wiper door works fine (after replacing a defective vacuum relay), I can't get the wipers to work anymore. I checked the fuse: It's fine. I can only get the wipers to move (just a little) when I push on the switch on the dashboard (as if asking for windshield wash): They move a couple inches out of their lodging and back, although not fully. However, I can't get them to work either in low or high speed.
That's weird because they were working fine before I replaced the vacuum relay (except that the wiper door would stay open all the time). And when I tested again after replacing the relay, they worked once, only once, and stopped for good. Again, the fuse is good.
Any hint is welcome.
That's weird because they were working fine before I replaced the vacuum relay (except that the wiper door would stay open all the time). And when I tested again after replacing the relay, they worked once, only once, and stopped for good. Again, the fuse is good.
Any hint is welcome.
The power override under the dash could be turned off or have a bad connection. Also if you have a vacuum door, the wipers won't run unless the door is all the way open and pressing the micro switch on the firewall. Tell me more about your car and what happens when you pull the vacuum switch for the wiper door (if you have one)
Team Owner
Joined: Jul 2006
Posts: 22,192
Likes: 4,180
From: Kannapolis NC
Also, if it's the car in your profile (71), the wiper switch has to be grounded in the center console. Mine didn't work and after troubleshooting all the overrides and safeties, I found that the ground where the wiper switch mounts wasn't connected to the car's ground. I added a small jumper wire from the mounting screw to ground and everything works fine. Willcox Corvette has a nice troubleshooting guide on their website to track down your problem.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Go take a look at connector for the red/white striped wire where the limit switch connects. I'd also check the plunger for the limit switch and make sure it's pushing the switch in all the way and then test continuity of the wiper limit switch. If nothing, then I'd make sure you didn't knock the ground off the motor... if they worked before it's probably something simple
Corvette Windshield Wiper Motor Wire Schematic 69-72 with test
Wiper Motor Bench Test 69-72
Wiper Motor Wire Testing
Corvette Windshield Wiper Motor Wire Schematic 69-72 with test
Wiper Motor Bench Test 69-72
Wiper Motor Wire Testing
Last edited by Willcox Corvette; Feb 11, 2015 at 08:17 PM.
Thread Starter
Instructor
Joined: Feb 2003
Posts: 164
Likes: 1
From: Houston Texas
Don't know what year you're working on, but does the door open (if you have one)?
The power override under the dash could be turned off or have a bad connection. Also if you have a vacuum door, the wipers won't run unless the door is all the way open and pressing the micro switch on the firewall. Tell me more about your car and what happens when you pull the vacuum switch for the wiper door (if you have one)
The power override under the dash could be turned off or have a bad connection. Also if you have a vacuum door, the wipers won't run unless the door is all the way open and pressing the micro switch on the firewall. Tell me more about your car and what happens when you pull the vacuum switch for the wiper door (if you have one)
Thread Starter
Instructor
Joined: Feb 2003
Posts: 164
Likes: 1
From: Houston Texas
Also, if it's the car in your profile (71), the wiper switch has to be grounded in the center console. Mine didn't work and after troubleshooting all the overrides and safeties, I found that the ground where the wiper switch mounts wasn't connected to the car's ground. I added a small jumper wire from the mounting screw to ground and everything works fine. Willcox Corvette has a nice troubleshooting guide on their website to track down your problem.
Thread Starter
Instructor
Joined: Feb 2003
Posts: 164
Likes: 1
From: Houston Texas
Go take a look at connector for the red/white striped wire where the limit switch connects. I'd also check the plunger for the limit switch and make sure it's pushing the switch in all the way and then test continuity of the wiper limit switch. If nothing, then I'd make sure you didn't knock the ground off the motor... if they worked before it's probably something simple
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
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