Hey 71C3LS5.....

I share your frustration, I'm a normally calm guy but admit I have tossed a few tools around the past few days monkeying with this.

Here's where mine get's interesting......I'm checking and rechecking each wire and realize that when I have the blue wire disconnected from everything in the system (relay, switch, motor, etc.) and touch it to ground, I hear a relay kicking somewhere down around my transmission! I've crawled under and tried to find it but can only determine that it's at the tranny, on the side or on top or something. Have to get it on the lift to see exactly what is up but someone has obviously been a naughty boy with the wiring on this beast.

I just have to keep reminding myself.....the worst day working on my toy beats the best day behind the desk. Besides my family there is nowhere I'd rather be.

Wish you were in the neighborhood, would be fun share a beer and figure these out together.....

 

UPDATE: I'm in the same boat now, isolated the motor to test it (again), grounded it, put power on yellow, ground to blue and it starts running fine but when I remove blue ground, still runs.....remove yellow power, still runs......only stopped when I killed constant power (red/white). Plugged only red/white back in, started running again, did this 3 or 4 times and it finally did not run anymore with only red/white plugged in, as if a (bad?) capacitor had to dissipate stored voltage. Pretty sure at this stage the motor is shot.

Still have wiring issues to chase though...wish I was not so damn ****, don't plan to ever use the wipers but can't stand the thought of something on the car not working properly, no matter the impact to my wallet or sanity.

 

I probably won't use them much either but I do want to drive the car and South West Florida rain in the Summer can come without any warning and it comes hard. I know I will end up caught without wipers and that would be a bad thing. Plus I am also **** in the fact that I do this for a living and if I can't fix something then that means I am not good at my job and for the must part I beleive I am.

I may pull the motor tomorrow and go for number 5 and of course I will bench test it first. I have been getting them from Advanced Auto for $65 I beleive which I thouht was the problem so I ordered one from Ecklers for $150.00 and it came in the same exact box and looked Identical and guess what it didn't work either. I sent it back and got another from Advanced. It worked on the bench so I put it in the car and here we are.

Buskey ,
Let me know how you make out.

 

Guys,

I'll look this over tomorrow and see if I can help. Great pictures too!

Hang in there both of you and well figure this out! Intersting on the black and white wire.

I may drive to my office tomorrow to look at my 70. I can ping the wire real easy since the center dash is still out of the car.

Now you have me wondering! I drew the original schematic off the GM diagrams, and what is so interesting is that this schematic has been used over and over again and no one has ever said there was a wire issue in the schematic. Proving it one way or the other will be easy for me, getting to the office tomorrow to check it may be a problem. I may have to wait until Monday.

Willcox

 

Your Assistance will be GREATLY APPRECIATED! I am Sure Buskey would Agree.

 

Absolutely, would love any assistance we can get. I'll get mine on the lift this weekend and see what the hell is going on down by the trans. Will post some pics of mine for you as well but it looks just like yours just without the factory molex connector at the switch and motor.

Thanks!

Bill

 

Update Saturday 5:10PM
It's not the Motor! I removed it from the car and bench tested one more time before going to the parts store to swap it out. At first it did the same as in the car it would not shut off without killing power to the red constant. However when I added the second ground to the 123 connector at #1 blue it switched to LOW speed as it should (According to Mr. Wilcox's instructions)and when removed it went to high speed. Now when you apply both the grounds to 1 & 3 then remove power from 2 it will park and turn off like it should.

So the question is HOW or WHAT switches both blue and green to ground and removes 12v from yellow at the 123 connector? I think this is were the addition of the relay circuit in its open & closed positions would a great addition and help to wiring diagram.
Mr Wilcox is obviously more familar with this circuit I am hoping he can offer an explanation that will help both Myself and Buskey.

In the mean time I will study the diagram and see if I can't figure out how to get the same results as the bench test:

ON THE BENCH:
Grounds to Motor Terminal #1 (Blue wire on Diagram) & Motor Terminal #3 (Green wire On Diagram) (+12v) @ Motor Terminal#2 (Yellow wire on Diagram) = Low speed

Ground to Motor Terminal #3 (Green wire on Diagram) (+12) @Motor Terminal #2 (Yellow wire on Diagram) & #1 (Blue wire on Diagram) open = High Speed

Ground to Motor Terminal #1 (Blue Wire on Diagram) & Motor Terminal #3 (Green wire on Diagram) & (-12v) Motor Terminal #2 (Yellow Wire on Diagram) open = Off/Park

 

Update 9:40PM Saturday
They are working now!
However I can't say I feel 100% confident in why they are working but they do everything thay are supose to; High, Low, Park.
What did I do? I was attempting do what I stated in the last post above which was duplicate in the car what I had on the bench. I don't think in the end it was an exact science.

First I had to swap #1 & #3 in the 123 connector at the wiper motor. This was the way it was before I started and I changed it to reflect Mr. Wilcox's diagram.

Second I had to turn the plug at the switch around also which to me clearly looks to be the wrong way but again it work perfectly so maybe the last guy pulled the wires and swapped them around.

Now for another discrepencie:
According to MR. Wilcox's Technical Fourm " The wiper switch is a grounding circuit only! Never Should you have voltage present on the wiper switch or any of it's connectors through out the entire harness" end quote.

There is voltage present at the wiper switch as follows:

Off:
Dark Blue +12V Blk/Wht - No Voltage Light Blue +12v

LOW: Dark Blue +12V Blk/wht - No Voltage Light Blue - No Voltage

HIGH: Dark Blue +12V Blk/Wht +12v Light Blue - No Voltage

I can understand why it is there too. It is on the Dark Blue because the 12v at the yellow wire in Mr. Wilcox's diagram shows it to power the windings of the washer pump therefore 12v is free to travel the windings and back to the switch through the dark blue wire

On the Light Blue wire there is 12v for the same reason only it is going through the windings at the relay through the yellow and light blue connector. You can prove this by unplugging either at the respective connector.

BUSKEY:
You may want to give this a try and if it work at your end as well we my have to add a new wiring diagram to this post should anyone else run into this.

Mr. Wilcox:
I welcome your thoughts on my findings

 

I don't know how you got it working either, I still trying to figure that out.

I looked at your pictures, you only have one light blue wire at the wiper switch and there should be two. I looked at your top picture, and I looked at the close up picture of the wiper switch with the connector on it. I only see one light blue wire.

The light blue runs from from the tach solenoid, to the switch and then to the relay. Is there a wire missing or am I just not seeing it. This might explain the voltate issue on the wires I'm not sure yet.

I will reiterate my statement; there should NEVER be any voltage present on the dark blue, light blue, black or green wires when the system is wired correctly.

Having voltage present is a sign of a missing ground wire from the system.

Number 3 light blue grounded to the engine should give you high, number 1 (green) and number 3 grounded should give you low.


Willcox

 

Now as far as the black and white wire, I did go to my office today and check the car. I do not understand how GM and all the other wiring schematics could be wrong but yes the center wire at my wiper switch connector is black with a white strip and yes it does feed continuity to the black black and white wire on the relay.

I did find another reference to the center wire on the wiper switch connector. This reference is on another vendors schematic which says the wire may be either black or black with a white stripe. This still will not excuse the error from the center wire to the relay in all the other schematics. However in this vendors schematic the wires are in the correct position.

I will correct the help page to reflect the change in the the two terminal connections as soon as possible..

Willcox Inc.

 

Well I have decided to put it back together since it is working and I probably will rarely if ever used them. I have taken some more pictures of the wiring as it is now so that maybe it will help someone else or maybe figure out why it is working in the current configuration. I will post these as soon as I can.

I need to know where the (NON A/c car) vac line @ controller in front of right control wheel. There is a molded 2 vac line connector. the top line has been cut off at about 6" inches from the front of the connector. Any Idea where this vsc line should be hooked to?

 

YES SIR! You are correct their is only one bule wire there! I cannot explain it either. I see in your diagram the yellow runs a similar path as the Light blue and the yellow appears to be per the diagram but the light blue does NOT double up and any of the connector points however there is continuity across it from wiper motor to Vac selenoid to wiper switch to relay. It does not appear that anyone has removed or altered it in any way. Everything was in the original untouched harness until I cut into it. I have no explanation but I tried to document everything I did or found and I can tell you after getting everything back together it works flawlessly. I only hope that Buskey has the same results! I'll post the last pictures I took tomorrow.

 

Hi, I did not get time to dig in this weekend, will try mine this week.

I have the same wiring - single blue wire to switch, relay and soleniod although all show continuity. My assumption is that that are combined somewhere inside the wiring harness.

Can you please help me with wire order on the switch and motor? As I mentioned, my factory connectors are gone so I have to connect the wires independently and the diagram only shows them in a row without orientation. Sounds like you reversed the connector at the switch from your last pic??

Thanks!

 

The light blue may T off in the harness somewhere too! As long as you have continuity between the wiper relay, the switch connector, motor, tach solenoid on the wire then you should be ok.

On my 70 the light blue wire is to the passenger side of the switch! (only two wires are present and not one).
On my 72 the light blue wire is to the passenger side of the switch! (There is only one wire present on this harness and it is original as well so it must T off somewhere in the main branch).

I just pulled the 71 AIM and it shows two wires going to the switch, but again it may be breaking off. I have the connectors in stock used too. I'm going to look at them and see if I can find one with a single lt blue wire on it.

From looking at the AIM the connector has a little tab on it that prevents the harness from being plugged in backwards.

Willcox

 

Note the top left, lower left and top right connector have a black wire in the center, while the 72 lower right picture has a black wire with a white stripe all only have one lt blue wire.

 

n/m

 

Holy SH*T! Mine works now too. Just like you I'm not really sure WTH I did other than plug everything back in, must have had the wire orientation incorrect but thought I had tried it every way before.

I also have voltage present at the switch & motor, same exact scenario as you:

Off: Dark Blue +12V, Blk/Wht - No Voltage, Light Blue +12v

LOW: Dark Blue +12V, Blk/wht - No Voltage, Light Blue - No Voltage

HIGH: Dark Blue +12V, Blk/Wht +12v, Light Blue - No Voltage

It works every time, no issues at all.

Thanks for all of the help! I can finally move on to other finishing touches.

 

One other thing I need help with - my wipers are parking in the fully extended position every time no matter where they are when I turn off the switch, anyone know how can I correct this??

 

Never mind, just had to disconnect from the motor and flip to the other side.....beautiful!

 

That was my suggestion. I am glad it worked out for you. ALL I have left is to re-install the cowl and hope the vacuum servos don't start giving me trouble but at least I know the wipers work. I had bought one of those twin turbo hoods from Ecklers it is the longer style hood for the 73's & up - that eliminates the cowl. IF I have anymore problems that will be my way out however I was trying to stay as stock as possible but the aftermarket hood opens up all kinds of possibilities for intake,carb & air cleaner setups.