Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 05-30-2018, 01:03 AM
Woj's Avatar
Woj Woj is online now
Yenko Paid Member
 
Join Date: Nov 2005
Location: Cleveland, OH
Posts: 1,487
Thanks: 0
Thanked 36 Times in 29 Posts
Default 69 Chevelle Wiper Motor will not turn off

Hi Gents,

I'm working on a 69 Chevelle for a friend. Basically finishing the last 5% of a restoration. Before I buttoned up the dash today, I tested the wiper switch and motor. It turned on, both speeds worked and when I shut it off, the motor parked and turned off. I didn't have the wiper arms on at this point. I subsequently put on the wiper arms and blades. Gave it another go and the motor will not shut off or park at this point.

Anyone been down this road before? Before I start taking the dash or anything else apart, I'd like to see if anyone has a good starting point to diagnose this.

Thanks.

Phil Woj.
Reply With Quote
  #2  
Old 05-30-2018, 01:31 AM
L16pilot L16pilot is offline
Yenko Paid Member
 
Join Date: Mar 2016
Location: Maryland
Posts: 83
Thanks: 8
Thanked 12 Times in 11 Posts
Default

I am not specifically familiar with the 69 Chevelle wiper motor, but I believe they all work similar in that the center terminal is 12 v hot all the time. The low speed terminal is grounded to start the low speed cycle. The high speed terminal is then grounded along with the low speed to achieve high speed wiper action. Then the high and low grounds must be removed in reverse order for the motor to park. My guess is the low speed wire is inadvertently grounded not allowing the motor to stop. remove the three prong plug and test either two outside terminals to see if you get zero-low ohms with the wiper switch in the off position. If you do...start tracing it back to the switch from there....could be wiring or could be internal to the wiper switch. Hope this helps
__________________
1970 Z28, Norwood 05C, original-unrestored,
1970 Z28, Norwood 03A, Finally to body/Paint Feb 2018
1980 Z28, Norwood 11D, nice original driver
www.2ndGenZ.com
Reply With Quote
  #3  
Old 05-30-2018, 02:36 AM
SS69chevelle SS69chevelle is offline
Yenko Paid Member
 
Join Date: Apr 2006
Location: NC
Posts: 160
Thanks: 1
Thanked 0 Times in 0 Posts
Default

mine did that as well, check the wires on the switch and I also wound up buying a new motor.
__________________
Andy
Team Chevelle #3135
ACES #08305
1969 Chevelle Trim Tag Research (On-going)
Reply With Quote
  #4  
Old 05-30-2018, 08:36 AM
Woj's Avatar
Woj Woj is online now
Yenko Paid Member
 
Join Date: Nov 2005
Location: Cleveland, OH
Posts: 1,487
Thanks: 0
Thanked 36 Times in 29 Posts
Default

Thanks for the replies. I will get the VOM out tomorrow and start testing.

Phil W.
Reply With Quote
  #5  
Old 05-30-2018, 01:29 PM
Woj's Avatar
Woj Woj is online now
Yenko Paid Member
 
Join Date: Nov 2005
Location: Cleveland, OH
Posts: 1,487
Thanks: 0
Thanked 36 Times in 29 Posts
Default

It ends up the problem is in the motor assy. I hooked up an NOS one to the wiring and each switch position functioned normally.

Thanks for the input.

Phil W.
Reply With Quote
  #6  
Old 05-30-2018, 03:11 PM
mockingbird812's Avatar
mockingbird812 mockingbird812 is online now
Yenko Paid Member
 
Join Date: Jun 2004
Location: Dayton
Posts: 13,264
Thanks: 213
Thanked 152 Times in 125 Posts
Default

Good deal Woj. I am going thru testing phase right now with mine. Waiting for a magnetic switch to come in which controls the parking function of the wipers.
__________________
Sam

Reply With Quote
  #7  
Old 05-30-2018, 04:19 PM
L16pilot L16pilot is offline
Yenko Paid Member
 
Join Date: Mar 2016
Location: Maryland
Posts: 83
Thanks: 8
Thanked 12 Times in 11 Posts
Default

Good to hear it was just the motor assembly...chasing wires can be very frustrating.
__________________
1970 Z28, Norwood 05C, original-unrestored,
1970 Z28, Norwood 03A, Finally to body/Paint Feb 2018
1980 Z28, Norwood 11D, nice original driver
www.2ndGenZ.com
Reply With Quote
  #8  
Old 05-30-2018, 04:59 PM
NEATSS NEATSS is offline
Yenko Paid Member
 
Join Date: Jun 2002
Location: Southern Illinois...40 mi S/E of St. Louis
Posts: 83
Thanks: 1
Thanked 0 Times in 0 Posts
Default

I had the very same issue. The motor will not stop until it goes into park position. A coil holds the parking paw until until the switch is turned off. At that time the paw drops out and causes the blades to go to park which breaks contacts to stop the motor. The coil that holds the parking paw is not releasing, be it mechanical or electrical. With mine it seemed there was residual magnetism holding the paw and keeping it from activating. I could not find a mechanical cause. I replaced the coil assembly with a used one and problem solved.

Last edited by NEATSS; 05-30-2018 at 05:01 PM.
Reply With Quote
  #9  
Old 05-30-2018, 07:43 PM
Woj's Avatar
Woj Woj is online now
Yenko Paid Member
 
Join Date: Nov 2005
Location: Cleveland, OH
Posts: 1,487
Thanks: 0
Thanked 36 Times in 29 Posts
Default

Is this something that can be repaired easily, or should it be sent out to someone who has already done this? The motor looks to have been restored already, but I'm not sure who did it?
Reply With Quote
  #10  
Old 05-30-2018, 08:13 PM
mockingbird812's Avatar
mockingbird812 mockingbird812 is online now
Yenko Paid Member
 
Join Date: Jun 2004
Location: Dayton
Posts: 13,264
Thanks: 213
Thanked 152 Times in 125 Posts
Default

Quote:
Originally Posted by Woj View Post
Is this something that can be repaired easily, or should it be sent out to someone who has already done this? The motor looks to have been restored already, but I'm not sure who did it?
Woj - my 49 y.o. motor looks pristine/new and was never restored. They are really encapsulated in there well. So your bud's motor may or may not have been restored. there is an adjustment screw (with a nut to secure it in set positon) at the end of the motor drive shaft that can be adjusted and will affect where the brushes contact the motor. You might check that that is set right.
__________________
Sam


Last edited by mockingbird812; 05-31-2018 at 01:20 AM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:03 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.