wiper motor/switch wiring
 

Hey all, looked at a thousand threads and tons of diagrams.. My books do not show this.. This motor came with a truck I am building, I assumed it was from a 61.. I just cannot figure this thing out. I labeled the opposite end of the one harness I have in case the colors did not show up in the pic. As you can see its a 4 prong on the motor and of course 2 on the pump.. it appears the open prong is jumped to where the pink wire is currently plugged.. Thanks in advance.

Reid

BRN obviously to the pump button (on the switch)
GREY to the speed terminal (on the switch)
Black (ground?)

On the motor the pink to fused power, I would assume if I plugged in the red to the jumped term.
and the white?

Re: wiper motor/switch wiring
 

I'm not familiar with the 63 & earlier factory color codes for the 2-speed wiper motors. However, with that type of 2-speed motor, the two center terminals (that are stacked above one another on the motor) are usually the +12V feed. One of those terminals receives power from the wiper fuse while the other terminal feeds power (via as short jumper wire) over to the washer pump solenoid.

The remaining outer two terminals on the motor are switched grounds that should be wired directly back to the dash switch. Some motors require both the switched terminals to be grounded for low speed and only one for high. But I think these round 2-speed motors might only need one terminal grounded for low and the other terminal grounded for high.

Finally, the remaining terminal on the washer is also a switched ground that should be wired directly back to the dash switch. Pushing the switch should ground that terminal, completing the circuit to energize the solenoid that engages the pump mechanism.

Re: wiper motor/switch wiring
 

Thank you for your reply. So basically since it appears obvious that this motor requires a separate ground for high and low.. The switch I have is a 3 prong.. that I would assume grounds itself to the dash.. so it may have the ability to handle 2 speeds and a washer.

The harness is what has been confusing me then as it appears it is made for a switch that needs a separate grounding source. I will have to get out the ole meter and do some cont testing.

Re: wiper motor/switch wiring
 

You're welcome! And your assumption is correct, the switch is case ground to the metal dash.

Similarly, the metal case of the wiper motor should also be grounded for the parking switch circuit to operate as intended. Without the motor case grounded it'll simply stop when the dash switch is turned off instead of continuing to run until the blades are parked.

Yes, some continuity testing of the switch terminals to it's case (ground) should help identify the terminals.

Re: wiper motor/switch wiring
 

Reid, I have a pic here somewhere of a '61 (?) 2 speed wiper wiring. Worst case I can take another pic of the truck at my shop.

Re: wiper motor/switch wiring
 

I figured it out, it was the harness that was confusing me with what appeared to be a ground wire. Thanks for the offer, soon enough I will drive her over.. if all goes well in the next couple weeks!