'67 Wiper Motor Wiring

[Detroit Iron]

Just three wires on a '67 wiper motor harness? I just want to make sure this is correct before I proceed with trouble shooting.

This is a two speed wiper and the issue is the wipers stay on with the switch in the off position. I can't say this is a new problem or an old problem because after I got this car I took it apart to restore it. So, I'm kind of starting from scratch here.

More information.... I have a new restoration under dash wiring harness, and there are four wires for the wipers at the bulk head.

 

[grjammer]

67 FSM shows 4.
same colors at the BH

 

[Detroit Iron]

Hmmm... so looks like one missing from the wiper motor harness?

 

[Mattax]

Hmmm... so looks like one missing from the wiper motor harness?

No.
There were 3 or 4 wiper motors and maybe three switches used in '67.
There was a two speed, a variable, and maybe a three speed???
Not all well documented in the service manuals.

See here.

Wiper Motor Wires

The wiper switch...............It has two distinct clicks but then rotates quite a bit more after the second click, almost another 90 degrees. There s a 2771378 stamped on the side. I believe this is a variable wiper switch? That number is the variable 3 speed switch. Just to add a little more...

www.forabodiesonly.com

Tell us which parts are on your 67, either by p/n or appearence.

 

[Detroit Iron]

Looks like I have the correct switch (2820525) for the motor. So what comes into question now are the wires going to the switch since the under dash harness is an M and H replacement.

 

[matthon]

For what its worth, I've had my 67 harness apart.

67 has 4 wires going to the bulkhead, but the brown is split and the green terminates.

Brown wire goes from A on switch thru A in bulkhead, spliced within harness in engine compartment, one wire to tab, one into motor.

Blue wire from P1 on switch thru B in bulkhead, to tab.

Red wire from F1 on switch thru C in bulkhead into motor.

The green wire from F2 only goes as far as the bulkhead.

 

[matthon]

Wiper switch contains the circuit breaker for the reverse lights.

Diagram attached is 68 up, supposed to be 67 up but it is incorrect for 67 as it has 4 wires going to the wiper motor.

From the switch are:
DK Green - to motor
Red - to motor
DK Blue - to motor
Brown - to motor
Brown TR - to washer
White - to backup light switch, yes, on the tranny, it then goes to the backup lights

The wiring at the bulkhead to the motor is short 1 wire:
Empty (s/b DK Green)
Red - to motor cylinder
DK Blue - to motor, the top
Brown - spliced, one wire sent to the cylinder, one to the top of the motor

 

[67Dart273]

Run over to MyMopar.com and get the FACTORY service manual Free

 

[Mattax]

Looks like I have the correct switch (2820525) for the motor. So what comes into question now are the wires going to the switch since the under dash harness is an M and H replacement.

View attachment 1716440401

View attachment 1716440402

View attachment 1716440403

read through the linked thread, it shows what we found for that combo.

@matthon Are you sure the CB for the wiper also is for the reverse lights? I always have assumed it was just auxillery power terminal.

 

[Dana67Dart]

There are only 3 wires.

67 2 Speed Wiper Switch Demystified

The blue wire has power all the time. The other 2 wires only have power when the switch is on.


The blue wire goes to the park switch which interrupts the blue wire on every rotation. When the switch is turned to off the blue still has power and provides that to the motor on the yellow wire til it is interrupted and the motor stops.


What would keep the motor running...

The park switch contact is stuck closed
The cam in the park switch is missing/broken
The park cam is stripped and not turning with the motor
The switch has a shorted connection.
The wires in the harness are switched

I have the same switch and motor. (BTW your car was most likely built in 67 the 66 builds to some point used a different motor)

Your motor wiring looks right compared to mine

You bulkhead wiring looks right

 

[Detroit Iron]

read through the linked thread, it shows what we found for that combo.

@matthon Are you sure the CB for the wiper also is for the reverse lights? I always have assumed it was just auxillery power terminal.

I read the attached thread. Everything seems to check out.

 

[Mattax]

Your motor wiring looks right compared to mine

I agree the connector wiring looks correct.

Check the switch wiring.

With the connectors attached (my '67 B)

With the switch off, the brown wire connected to A may act as the ground to complete the circuit.
Here's description of an earlier 3 speed switch.

Testing a wiper motor

How can I test a 3 speed wiper motor before I go through the trouble of replacing my two speed wiper motor. Thanks,Jim

www.forabodiesonly.com

 

[Mattax]

I read the attached thread. Everything seems to check out.

I would think its either the switch under the white plate is not disconnecting or the low speed feed is continuing to supply power to the motor.
Dana has dug into these more recently than most other.
A couple other guys who have worked on these leece Nevilles are
@matthon @Troub

 

[Detroit Iron]

I would think its either the switch under the white plate is not disconnecting or the low speed feed is continuing to supply power to the motor.
Dana has dug into these more recently than most other.
A couple other guys who have worked on these leece Nevilles are
@matthon @Troub

I think you're on to something with the switch under the plate. I'm checking that next.

 

[Detroit Iron]

This is what's under the plate. I'm not really sure what I'm looking at here. Could the problem be with the clocking of it?

 

[Dana67Dart]

This is what's under the plate. I'm not really sure what I'm looking at here. Could the problem be with the clocking of it?

red is the contact that opens every revolution

Blue is the cam that rotates ( i might have the arrow the wrong direction)

Function...

the plate in the motor should rotate (green, I might have the arrow direction backwards) when the motor spins

The red arrow should engage with the red arrow on the cam causing the cam to rotate and opening the contact once per revolution

Assuming you have the connectors attached to the bulkhead and the switch , with the switch in the off position, momentarily hook the battery up and watch for rotation of the green. disconnect the battery and manually rotate the cam (Red arrow by the contacts) till the contacts open. reconnect the battery, if it still rotates the problem is in the switch or the wiring along the way

 

[Dana67Dart]

Did you check your wiper switch

 

[Detroit Iron]

red is the contact that opens every revolution

Blue is the cam that rotates ( i might have the arrow the wrong direction)
View attachment 1716440487

Function...

the plate in the motor should rotate (green, I might have the arrow direction backwards) when the motor spins

The red arrow should engage with the red arrow on the cam causing the cam to rotate and opening the contact once per revolution

Assuming you have the connectors attached to the bulkhead and the switch , with the switch in the off position, momentarily hook the battery up and watch for rotation of the green. disconnect the battery and manually rotate the cam (Red arrow by the contacts) till the contacts open. reconnect the battery, if it still rotates the problem is in the switch or the wiring along the way

With the key on and the wiper switch turns off as it should when I open this contact (pictured with blue arrow). Additionally, speeds 1 and 2 work as they should. Could it be this contact is staying closed?

 

[Detroit Iron]

Further investigation.... I don't believe the cam is contacting the plate.

 

[Detroit Iron]

I think I see what's going on. The white plate has become domed from engine heat and age. So that pulled the cam away from the plate in the motor. Cool Hand Luke... failure to communicate.

 

[Mattax]

The one on mine has shrink very slightly but still works.
I don't think I have any photos. Lemme look.
Not with the plate off.

At one time I was looking for a new switch plate and found the part number and someone somewhere selling one. Or maybe it was an old ad because I did not buy it. If that's really the cause might have to buy a used one.

I'll say this. My car came from Arizona - so it saw some heat. And twice since I've owned it, I've had headers on it - including currently. So I would think that they are pretty heat tolerant.

 

[Dana67Dart]

The white plate has become domed from engine heat and age

Is it possible the top plate was installed incorrectly and the cam nub was not in the correct position and caused the top plate up be raised? Just spit balling.

The top plate is remanufactured.

 

[Dana67Dart]

If you pull the blue wire out of the bulkhead connector you can turn the switch on and off so at least the wipers will stop somewhere.

 

[Dana67Dart]

. Additionally, speeds 1 and 2 work as they should. Could it be this contact is staying closed

Yes

 

[matthon]

Are you sure the CB for the wiper also is for the reverse lights? I always have assumed it was just auxillery power terminal.

Yup. I've had to turn the wiper switch back and forth to get the reverse lights to come on.

I'd put it in reverse, no lights or wipers, turn switch back and forth, both go on.

It's a real thing they did in 67.
There are multiple threads on this, a number of them have me chiming in or starting it trying to figure out wth is going on.

I have since powered my reverse lights off of something else and took my wiper switch apart and cleaned it to avoid this going forward.
Everything works fine now.