2-spd. wiper motor: how to wire? (w/o plug or original wiring existing)

[TobiasM]

Hi Mopar-enthusiasts.

My "street-legalizing"-project does make progress, but I am stucking with correct wiring of the wiper-motor.

The challenge with my Challenger is, that it doesn`t have its original wiring left, so I don`t have anything to lead me the correct way. Already crawled the www and this forum, but all posts where for existing original wiring / plugs. So I try here with a new post.

I attached a picture of the wiper-motor I got, by its numbers, it`s a 2-speed wiper motor for BCE-bodies from Feb. 73 upwards (# 3431718).

It has one 4-socket connection and a 2-socket-connection.

The 4-sockets should be for 1) continious pwr from battery (for returning to park-position), 2) ignition-power, 3) speed I and 4) speed II. But where is ground-connection?

The 2-socket-connector should be a resistor to change between slow speed and high-speed.

And: is there a relay needed and where to put a fuse/fuses?

Any help is welcome, as I don`t want to blow this motor by connecting it wrong.

THANKS!

[dodj]

Do you have the connectors to make the harness?

[ShelbyDogg]

Here you go.    Viewed from the INSIDE END, looking at the pins in the wiring connector.

[TobiasM]

Scott, Rob,

thanks for your efforts.

No, I don`t have the connector... I`ve only got, what you see in the picture. I will attach the cables directly to the ports/pins on the wiper-motor.

That is the reason, why the nice wiring-diagram doesn`t help me that much. Could you please point out which port/pin on the wiper-motor has which function?

[dodj]

Looking at your bulkhead connector from the front of the car, the wiper connections are the four on the top left. Top left bulkhead connection is wire #1. Connect it to one end of the low speed resistor. The other side of the resistor goes to the top right (vertical) connection on the motor. Top right bulkhead connection is wire #5. Connect it to the bottom left (horizontal) connection on the motor. Bottom left bulkhead connection is wire #2. Connect it to the bottom right (vertical) connection on the motor. Bottom right bulkhead connection is wire #6. Connect it to the top left (horizontal) motor connection.
This is from a '73 service manual. I can't guarantee they were wired the same for all years. 70's always seem to be different.

[ShelbyDogg]

I guess mine is from a 70 then. Your wires are different from the diagram that I drew. Mine came directly from looking at the cable itself.

[dodj]

The red and brown are switched.

[TobiasM]

Ok, so let`s nummerize the pin`s and the summarize your given information.

4-pin-connection ON THE WIPERMOTOR (clockwise):

Pin 1 = upper right + vertical one (red in Robs diagramm, is switched, should be "low speed", as it is conneted to resisitor, too)

Pin 2 =  lower right + vertical one (brown in diagr., is also switched, but without resistor, should therefor be "high speed")

Pin 3 = lower left + horizontal one (blue in diagr.)

Pin 4 = lower upper left + horizontal one (green in diagr.)

Could you please tell me, what Pin 3 (blue) and Pin 4 (green) are exactly for? Constant Power, Switched / Ignition Power, Parking-Position

Thanks!

[ShelbyDogg]

I have 2 harnesses and both are wired like this;

[dodj]

Interesting. Obviously the '73's are different. Things that make ya go hmmmmm...

[ShelbyDogg]

In my stash I have 2 3-speed switches that are totally different too. I don't remember having any three speeds.

[dodj]

Shelbydogg,
Maybe one is a variable and one is a 3 speed?

Tobias,
I can't say what colour does what function in your car. My '73 is obviously different from Shelbydogg's. Since yours is a '70, I would just copy Shelbydogg's harness and you should be good to go.
If you want to, and have a meter handy, you could check to see what switch positions sends 12vdc to what bulkhead connections and you would be able to figure out what each wire does.
The one that never gets 12vdc on it would be the switched ground.
The one that has power on it when the switch is off is the power for 'parking'
The other two wires are for low and high speed and will have power on them when the switch is in low or high speed.
Hope this helps. 

[TobiasM]

Thanks for your help, guys!

Got the wiper-motor running.

Interesting is, that is it doesn`t make a difference in motor-speed, if you connect Pin 1 (upper vertical Pin) to the resistor or not. My father suggests it to be only a "filter-resistor" (correct word?) to eleminate bad frequenzies produced by running the wiper-motor which would interfere with your music-radio-frequenzy.

So the wiper-motor`s speed is just depending on if either Pin  1(upper vertical) or Pin 2 (lower vertical) get power, meaning that the motor has an internal resistor placed behind Pin 1.

Again, thanks for your help, great forum here, with great people!

Best regards from Germany.

[dodj]

  from 

[ShelbyDogg]

Thanks for your help, guys!

Got the wiper-motor running.

Interesting is, that is it doesn`t make a difference in motor-speed, if you connect Pin 1 (upper vertical Pin) to the resistor or not. My father suggests it to be only a "filter-resistor" (correct word?) to eleminate bad frequenzies produced by running the wiper-motor which would interfere with your music-radio-frequenzy.

So the wiper-motor`s speed is just depending on if either Pin  1(upper vertical) or Pin 2 (lower vertical) get power, meaning that the motor has an internal resistor placed behind Pin 1.

Again, thanks for your help, great forum here, with great people!

Best regards from Germany.

  That resistor should be put in series with pin 1. it is to share the current with the motor when getting power from the red wire. It isn't for noise suppression such as a capacitor is used for. If you have it, you should use it.