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Re: Testing a wiper motor
[Re: 440mopar]
#2371361
09/15/17 06:57 PM
09/15/17 06:57 PM
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Joined: Jan 2003
Posts: 1,238 Chicago, IL
PLUM_72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,238
Chicago, IL
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When you have everything in the car, how is the ground on the wiper switch? On my Challenger I ended up running a secondary ground wire from the metal frame the wiper switch fastens into to the body of the car. Prior to that the metal frame was grounded via one hold down/mounting screw to the dash. Figured this ground point wasn't solid after almost 50 years. The switch has to have a good ground.
Not sure on two speed wipers, but on three speed wipers, there is a contact inside under the center cover that affects the park feature. I took a mini file and dressed the contacts. Worked wonders.
1972 Dodge Challenger
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Re: Testing a wiper motor
[Re: PLUM_72]
#2371692
09/16/17 01:47 PM
09/16/17 01:47 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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Grounds, grounds, grounds. If the switch isn't grounded or isn't installed in the dash with a good ground nothing works right. Hold the switch in you hand with power on and touch ground you'll feel it. As for the stopping,the 2sp motor can have a lot of grease inside on the gears. Over time that grease hardens and things slow down or stop moving. Other than rusty outsides usually that's all that's wrong with the motors I get from customers. They can be restored. Bruce ns1aar.com
Last edited by ns1aar; 09/16/17 01:50 PM.
NS1AAR
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Re: Testing a wiper motor
[Re: 440mopar]
#2371868
09/16/17 08:51 PM
09/16/17 08:51 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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There are 4 different 2sp wiper motors and hard the identify. 69-70 A/B and 71 A are all non reversing motors 5/16 shaft 72 and up A non reversing 1/4 shaft 70-71 E and 71 B reversing 5/16 shaft 72 and up B/E reversing 1/4 shaft
What car do you have
Last edited by ns1aar; 09/16/17 09:14 PM.
NS1AAR
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Re: Testing a wiper motor
[Re: ns1aar]
#2371870
09/16/17 08:54 PM
09/16/17 08:54 PM
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Joined: Aug 2007
Posts: 732 USA
440mopar
OP
super stock
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OP
super stock
Joined: Aug 2007
Posts: 732
USA
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Re: Testing a wiper motor
[Re: 440mopar]
#2371882
09/16/17 09:28 PM
09/16/17 09:28 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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You need to make sure that all 4 of the terminals on the wiper motor are dull silver. If one is Brass that is the reversing motor and won't work with a-body switch
Last edited by ns1aar; 09/16/17 09:28 PM.
NS1AAR
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Re: Testing a wiper motor
[Re: 440mopar]
#2372929
09/18/17 08:36 PM
09/18/17 08:36 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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That's the correct motor. Try a continuity test on the wiring and the switches.
NS1AAR
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