Do I have a faulty Wiper switch on 1980 jd 4240?

toopoor2fix

New User
I have a JD 4240 that I had to replace the right hand windshield wiper motor with a new motor that replaces the OEM motor that is no longer made. The old motor had only 3 leads (low speed, high speed, and ground). The new "universal jd" motor has 5 leads which appear to be low speed, high speed, park, washer mode, and ground.

Connected new motor to the low, high and ground leads from the tractor. Left the other two leads on the motor alone.

My problem is that if I turn the switch on, nothing happens, however, if I turn the key off, turn the switch on, then turn the key on, the wiper will operate normally.

I can also have the key and switch on and disconnect the lead at the wiper motor and motor will start and operate normally.

I am of the opinion that the circuit breaker on the switch is tripping when the switch is turned on.

It seems to me that if the motor start load is too much for the circuit breaker, it should trip all the time, not just from turning the wiper switch on.

There were no instructions with the new wiper motor, so I am hesitant to replace the switch, without knowing whether I needed to have wired the motor differently from what the old motor was.

I am the third owner of this tractor and it is obvious the wiring under the dash and under the cab are far from original.

What I am confused about is why wiper motor will operate normally if the switch is turned on before power is applied to the motor, but not if the wiper switch is used to supply the power?
 
Go back to the dealer and start with the parts guys, ask them if there is any info for that part number, if no luck then talk to the service manager. That's what I do when I get a part that is not like what I removed.
 
There are so many ways it may be wired, without a diagram it's a risky game.

Obviously it is not wired correctly, and guessing is very likely to let the smoke out.

Good advise from matthies, take it back and get more info or return it.
 
Talked to the parts guys, no info. Service manager has no experience. Nice young guy, but by his own admission, if it is pre-computer diagnosis he has no experience. Several Dealership stores consolidated in the last couple of years. The people with the experience dating back to Sound guard cabs have taken the incentives to retire. Thus I was hoping someone on here had some experience with this part substitution and/or switch issues.
 
Is there a brand name on it? Delco, Autolite, etc?

If so, search "2 speed wiper motor wiring".

Typically, Delco runs power to the motor, the switch makes the ground for various speeds and functions. The Autolite, Motorcraft ground the motor, power through the switch.

You might be able to open the cover, see what does what.
 
Had to let my braine tick a few times. You said you stuck a universal motor on
with a couple of more wires. One of those wires is the PARK position. The motor
will automatically go to the park position when the key is turned off. That is
what you are having trouble with. Try looking on the net for a diagram.
 
Sorry, I didn't see the other post. Yes it can also be a two speed. And it can also have park too. Easy thing to do. Buy a box of ten amp fuses at the carpart joint. If you do something wrong the fuse will pop. Just touch a hot wire with a fuse in line and you will figure it out. If this was the air handler blower in a furnace I could tell you the codes. Some furnaces have only one speed. The most I have run into are four speeds.
 

RH windshield wiper motors I locate don't have 5 leads/wires. What is part # on wiper motor you have?

mvphoto48970.png
 
I agree with Jeffcat-it's not wired correctly. The wire for park is hot with switch in off position. The speeds will be hot as you turn the switch up. Probably no power to switch unless key is on. This is the generic setup. Mark.
 
Do a search for Wexco industries and select a link that has the wexco 2012 pdf catalog in it.

Search the catalog for the part number of the motor you received.
Guessing 1422-3110013 is what you have or similar.
It will show you where the wires need to go and what they do.
 
Tx Jim you had my hopes up. Looked up the add you provided and find that it is actually an add for the LH wiper. The first image they show and description is for RH, however, the next two images and the technical data is for the LH.

All of the adds for the actual RH wiper motor that I have found show a 5 wire plug, like the one JD sells and the one I have.

Thank you for looking.
 

Sorry for the mistake. All I did was enter the part # RE234000 but didn't proof read it before posting. The wiring harness(key 29) for RH wiper only appears to have 4 wires.

mvphoto48984.png
 
Thanks to all that commented. It was very helpful. With the added information, it appears that my lead identification is right, except the lead I thought was for use in connection with a washer is identified for use as switch (live) power in those uses where the low and high speed settings create a ground through the wiper switch. That is not the case on the jd 4240. The low and high speed leads are live and they were all that was needed with the original motor that had the park internally wired within the motor. The original third wire was a ground to insure continuity between the motor and the rotary switch circuit breaker to make sure the motor did not burn up if the wiper was froze to the window etc. I also know that if I provide the "switch" lead with electricity (not through the rotary switch), the wiper will run as long as there is supplied power. The park lead will operate as expected in that if power supplied the motor will run until it reaches the park position.

The original 3 lead motor was discontinued in 2012 and substituted with the 5 lead motor I have. The substituted wiper motor also refers to a new wiring harness, and as TX Jim has pointed out newer diagrams show a 4 wire lead. I am guessing the 4th wire is for the park wire that was previously wired internally in the motor.

So I need to find out how the newer substituted motor is to be wired.

There is still a chance somebody on here will have been there and done that.


Thanks again.
 

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