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Wiper motor always working.


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#1 GTR-1

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Posted 02 May 2021 - 05:19 AM

My wipers are always working when the ignition is on, I can pull the wires off the control switch on the dash but the wipers are still going
What is going on here?


#2 S pack

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Posted 02 May 2021 - 09:07 AM

Not sure but I suspect the fault is in the electrical contacts inside the wiper motor.



#3 claysummers

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Posted 02 May 2021 - 10:43 AM

Something in the motor is earthing to the car body which shouldn't be. Could be in the park mechanism. Make sure the motor is insulated from the body, apart from the park earth. I don't know your particular set up but that is the general principle. The motor always has power and is switched by earth if thst makes sense.

early Holden nut

#4 rexy

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Posted 02 May 2021 - 10:18 PM

You have a short....



#5 ls2lxhatch

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Posted 03 May 2021 - 02:02 AM

Another possible cause is no wiper blades.

 

If you don't have any wiper blades fitted then the wiper park circuit will run the motor which will can then overshoot the dead park zone and keep going. The resistance of the wipers on the glass will stop the wiper motor in the dead park zone.



#6 Rockoz

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Posted 03 May 2021 - 10:20 AM

Im bench testing a couple, and so far they have both stopped in the park position with no external force.

Have a third one Im doing today, will see how it fares.

 

Cheers

 

Rob



#7 GTR-1

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Posted 03 May 2021 - 04:17 PM

Something in the motor is earthing to the car body which shouldn't be. Could be in the park mechanism. Make sure the motor is insulated from the body, apart from the park earth. I don't know your particular set up but that is the general principle. The motor always has power and is switched by earth if thst makes sense.

early Holden nut

I have a 72 GTR with standard wiper motor setup. The motor is insulated with the triangular mounting pad and the 3 circular rubber mounting grommets.

The motor does seem to be "live", a test light will light up. 

Will have to pull it out this week and have a look



#8 claysummers

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Posted 03 May 2021 - 04:41 PM

Did you pull the switch wire off the motor terminal? If not could be a short in it between motor and switch.


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#9 Statler

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Posted 03 May 2021 - 05:10 PM

The brass tang which falls into a recess to break circuit has broken off.

 

Pop the cover & give us a look .



#10 GTR-1

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Posted 08 May 2021 - 11:50 AM

So I pulled out the wiper motor, after mucking around with it for a couple of hours, put it pack in and it works fine.

Not entirely sure what I did to make it work properly which is a bit of a bastard as I really wanted to know what the exact problem was.

 

Thanks for the input guys






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