Kenworth T2000 Electric Wiper Wiring (transplant to bus)

[Melbo]

I just acquired the electric wiper motor and control switch for a kenworth T2000 -- I have the chassis number if it makes a difference.

There are six wires from the switch and they are labeled as follows

P71WM
C71HI
C71LW
C71SW
C20WW
GND

Then there are only 5 wires from the motor connection

P71WM
C71HI
C71LW
C71SW
GRD

I have figured out that the GND is the ground (see I really am not totally helpless just mostly) and it would appear that the wires that are labeled the same would connect BUT is there a relay or other device that goes between the switch and motor and I don't want to damage anything by supplying power where it doesn't belong however the only place to supply the 12 volts appears to be the wire labeled C20WW. It could be that the power is supplied at any of the other wires also.

I tried to find a wiring diagram on the internet but was unsuccessful in finding one.

Any help or information will be appreciated.

Melbo

[zubzub]

seems like you've got it worked out.  power to the extra wire.  that being said I don't know how much you paid for the stuff and if you want to make a $ mistake.  I know I would look at this and put power to the c20ww, but I also know that I have burnt up a few things in my day.

[gumpy]

Just a guess, but I'd think the C20WW is probably for Windshield Washer pump.

I would expect P71WM to be Power input.


Would expect C71HI to high speed wiper, C71LW to be Low speed wiper.

Can't figure out what C71SW would be, though.  Maybe single pulse for intermittent?

Can you ohm out the switch or is there electronics in it for intermittent action?

[VanTare]

some 2000t have a rain sensor if you can post the year model I can check with the fellows in the shop maybe they have a wiring diagram,but it will be a few days before I can get back to you I am off to Tampa for the big game.

David

[Melbo]

The wiper motor and switch came off chassis number 887827 I don' t know it that helps but if necessary I can find the year also.

I took a digital multi tester and checked it out to see what I could learn.

There are three positive positions on the switch.  They are not labeled so I can only guess but it appears to be OFF Variable ON LO and ON HI

With the switch in each position the C71SW and the C71LW show continuity including the off position.

With the switch in the hi lo or int setting there are variable and inconsistent readings sometimes only momentarily when the meter is first in contact with the wire.

Isn't there also something in the switch or motor that "parks" the wipers when you turn them off??

With four wires and the ground going to the wiper motor there has to be more going on than just hi and low because intermittent would come from the switch wouldn't it???

I thought -- but might be wrong -- WM was for Wiper Motor  HI was High and LO was Low and SW is for the switch just my thoughts as I read the wire labels the C20WW made no sense to me --- that is the reason for my post

Thanks for the help and suggestions.

Melbo

[gumpy]

That's why I thought WW was for washer. Does the switch push in for washer. That's the way they used to be on all cars. Turn the button for the motor, push in for washer. Switch was interlocked so if you pushed in, it would turn on so you couldn't spray your windshield without the wipers turning on to wipe it off. Safety issue.

[prevost82]

Maybe Tom C can help you get a wiring diagram. I think he works a KW dealer.

I got mine out of a NaviStar, so I think the wire numbers what be different. I also have 2 switches / OFF, LOW, HI / and intermittent and washer.
On mine, you use the intermittent switch with the HI/ LOW switch in the OFF position.

If you need a linkage layout to use a single motor let me know.

I design a cross linkage so the wipers park in the center and sweep to the outside together.



The wiper switches are the two on the top right of thje switch panel.

[Sojourner]

Look for spare power terminal in wiper unit. Usually "park" feature mean live power from ignition to motor first. I believe the ones you posted is the remote circuit for that motor.

I am not up to date since 1980s. So this is just my suggestion.

In the mean time most new class 8 truck wiper system are same, whether it Freightliner or Kenworth. They are made by one or two manufacture to supply most USA class 8 trucks. So if any one has a wiring schematic and go to a truck service center for one.

FWIW

Sojourn for Christ, Gerald

[Melbo]

Well it appears that Gumpy is right about the washer. If I check for continuity between the C20WW wire and the P71WM wire there is none until I push in on the button.

I'm guessing that he is also right about that being the power supply because that is the only way that it would send power to the washer.

Gerald I like the idea of getting a schematic from a truck service center. I have worked with the Cummins people here and will check with them if they can help me.

Zubzub you and I were thinking alike and it might have worked if I held in the button because then it would feed the current back to the switch but I'm liking the idea more and more of going to a shop and getting a schematic to work from.

Thanks for all the tips and help

Melbo

[NJT5047]

Are you sure that there isn't a separate module of some sort that times the intermittant feature?   Usually a small plug-in 2" square box.  May look like a relay.
Most vehicles have a hot wire to the wiper motor....the wire powers the park mode when power is removed from the motor and the motor isn't in the park position.  May be that the switch feeds the park mode? 
You need a diagram.  That would take the guesswork out of the project....take away the fun of figuring it out too. 
Post some pix of your project if possible.   This is a project that I'm wanting to do.  Air Push wipers are quality items, but they just don't stay exercised in most bus conversions.   
If you have any automotive manuals around, there may be considerable similarity between automotive and truck wiper wiring. 
JR

[NJT5047]

Maybe Tom C can help you get a wiring diagram. I think he works a KW dealer.

I got mine out of a NaviStar, so I think the wire numbers what be different. I also have 2 switches / OFF, LOW, HI / and intermittent and washer.
On mine, you use the intermittent switch with the HI/ LOW switch in the OFF position.

If you need a linkage layout to use a single motor let me know.

I design a cross linkage so the wipers park in the center and sweep to the outside together.



The wiper switches are the two on the top right of thje switch panel.

I'd like to see what you've done with the single motor.  Any information would be appreciated. 
BTW, looking at your dash pix, looks like spring brake park button?  Or does Prevost have a cool looking DD3 park button?
JR

[Brian Diehl]

Just a thought ...

I was able to call Freightliner with my chassis VIN and get any wiring diagram in PDF format that I needed.  I just acted like I owned the truck, which I did, just wasn't a "truck" anymore, and told them I had a wiring problem I was trying to fix.  They got me the wiring diagram by pdf within hours in my in-box.  Have you tried calling kenworth?

[Brian Diehl]

some pictures on my single motor conversion ....

http://www.busconversions.com/bbs/index.php?topic=9222.msg91749#msg91749

[NJT5047]

some pictures on my single motor conversion ....

http://www.busconversions.com/bbs/index.php?topic=9222.msg91749#msg91749

Thanks Brian!  That's exactly what I was looking for.   
JR

[Brian Diehl]

I have a few additional pictures I could send by email if desired.  Just let me know.