Wiper motor, five wires, pulled from an early W111.

Brown wire is ground but that leaves four other wires. Can anyone tell me how to bench test the functions?

The wiring diagram just shows four wires coming off the motor. One is going to the foot pump switch but how do I test the functions of the other three?

When I put 12v to one the motor turns over. When I put 12v to the other three wires I get nothing.

Can you post a diagram? Be careful probing around, there will be a parking switch in the motor that can be damaged if power is placed across it. ( the switch is closed when the motor is off park and opens when it hits park. )

The five wires coming off of the motor are.....

Brown. This is the ground. At least it functions as a ground.

Black with a red and green stripe. Put 12v to this and the motor turns.

Black with a red and white stripe. This wire does nothing.

Black. Solid black. This wire does nothing.

And another Black with a red and a green stripe. This wire does nothing.

By does nothing I mean nothing when I put 12v to them.

It is a Bosch with the letters WS/JC2/ 12/2

I don't really care if this has to go down for a total rebuild. I am rather handy at this sort of thing.

It is just impossible to figure out the wiring without a car to plug it into.

Thanks

I'm l looking in the Big Blue Book which unfortunately does not list color codes.

3 wires go to the wiper switch
1 wire goes to the washer pedal
and your ground.

Oh wait a minute - if I turn a few more pages I get color coding:
Everything is a black wire with additional coding. Except the brown which is ground. Here is what the BBB says:

Assume black wire PLUS striping:
Striping:

violet/blue - from wiper switch terminal 1 to wiper motor terminal 1
violet/white - from wiper switch terminal 2 to wiper motor terminal 2
violet/green - from wiper switch terminal 3 to wiper motor terminal 3
violet/white - from foot pump terminal 2 to wiper motor terminal 2

That's what the book says. I assume violet = red in your case?

Scott

Thanks! I am guessing violet is red. The colors are somewhat faded after all these years.

I will have to run the tests tomorrow. This is located out in the workshop and there are too many wild animals around here to venture out there this time of the night.

I will let you know what I find out.

If power is applied across the parking switch for example, there will be little to rebuild as all of the smoke will have leaked out of the switch. If you can't find a good wiring diagram that shows internal connections, take it apart and draw one.

The wiring diagram and terminal connections are shown in the BBB. I suppose to be useful I would need to say what the other terminals of the switch go to so that the original poster has some chance of success. I suspect (but not sure) that one of the terminals on the switch is +12V switched, but I would need to check. The terminals on both the motor assembly and the switch are numbered (I think).

Updated:

Assume black wire PLUS striping:
Striping:

violet/blue - from wiper switch terminal 1 to wiper motor terminal 1
violet/white - from wiper switch terminal 2 to wiper motor terminal 2
violet/green - from wiper switch terminal 3 to wiper motor terminal 3
violet/white - from foot pump terminal 2 to wiper motor terminal 2

AND

Assume black wire PLUS striping:
Striping:

violet - from fuse box terminal 15/54 to wiper switch terminal +
violet - from fuse box terminal 15/54 to wiper motor terminal +

I have no explanation as to why it says there is a terminal marked +, I don't think that exists. But that's what it says in the BBB;

I am just going to take this apart and develop, if possible, a set of instructions for bench testing.

Right now I have one screw that is frozen so I am waiting for the magic elixir to de-rust it. I am skipping the wiring colors since they appear to vary over the years and going directly for the electrical pins on the motor assembly.

So far, out of the five pins, I have figured out which is the ground. I am also figured out that the rubber gasket is NLA so be careful when you remove it since you will need to reuse it.

The wire colors aren't terribly relevant, what is important is which terminals connect to which terminals on the switch, and on +12V, which is contained above. I don't particularly see a benefit in dismantling the thing until you know it doesn't work. If you need to borrow the appropriate switch I'm happy to loan you one.

cheers
Scott

Thanks, but I like to tear things up.

And this is a chance to delve into a wiper motor like I have yet to see.

So I took the screws out of the mounting plate. This accomplished nothing. I also took the lever off that drives the wiper linkage assembly. CAUTION: This is a press fit, like a windshield wiper, and you need to mark the position before removing it. There are no marks on the assembly to tell you where this goes.

The photos below show what it looks like in the electrical box.

The three pin in a row will be called one, two and three with one at the left of the photo and three at the right.

Number one is the ground.

Two seems to do nothing at this point. Note that two is connected to three via a capacitor looking thing. 12v applied to three will make the motor run.

The other two plugs, call them blue and white, are wired to some sort of block that is isolated from the metal body. They are connected to each other through the block but apparently not to anything else. Should they be connected to the dual black wires also on the block?

The two black wires on the block, at the bottom of the block in the photo, go into the armature of the motor, or into the wiring anyway, and they are also connected to the ground.

The good news is that there is no reason to remove the gasket or the mounting plate as they are connected to the gearbox. I removed the two long screws at the end of the motor and just pulled the whole thing apart.

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And....

I have access to a few of these. If you have a suggestion as to what to try next I am not worried about tearing this one up.

I am only concerned with finding a way to bench test these in the future.

Of course, figuring out a repair would be nice, too.

What you are calling a cap looks like a resistor. This would be an odd way of controlling speed and most used a third brush for speed control.

Have you found any brand markings? MB probably didn't make this so other makes of cars probably have similar / same basic motor and wiring.

Well, it is a Bosch unit. This is from 1962.

I didn't know the photos would be upside down. The model number is WS/JC2/ 12/ 2.

And thanks for bringing that up. I should have mentioned it during my initial posting.

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Well, every wiring diagram I have run across will not tell me what I want to know.

So I am going right to the source and hooking up the switch. It is a bit easier to decipher.

When I know something I will post it. There has to be a simple bench test for this item. And if not there soon will be.