[SNFU Mobile]

I'm sure I'm missing something simple here.

Anyhow - I ordered a 2 speed, 4 post wiper motor for a '65 from Year One. It arrived today, and I did some searching and found a few posts on how to wire this thing up. The 4 posts run vertical, and starting from the top I have :

+12v
+12v
Empty
Empty

Now - from what I understand, I ground the third terminal from the top down to initiate the low speed wipers. Conversely, I ground the bottom terminal to initiate the high speed wipers. I have the motor grounded well.

Now, here's my problem :

When I ground the third terminal from the top, the motor starts, and it runs steady. As soon as I remove that ground, it continues to run, but at what seems like a slower pace. It never stops. I have to ground the bottom terminal for it to stop. When I ground the third terminal, and let it run, and then ground the fourth terminal, it always stops in the same place - leading me to believe it's parking.

Now, when I ground the bottom terminal without grounding the third terminal first - nothing happens. But, when I remove the wire, it sparks, leading me to believe that there's current flow through that bad boy. But, the motor doesn't turn.

Anyone ever seen this before? Did I receive a defective motor?

On a different note - this thing didn't come with the arm that links the motor to the wiper transmission - anyone know where I can pick one of those up? I have the square style motor.

Thanks!

 

[SNFU Mobile]

Also, it looks like I may have converted from the round style washer to the square style - since it looks like the wiper transmission arm is a little long for where the motor arm will eventually land - maybe an inch and a half / 2 inches or so.

Is this the case? Did the round and the square motors have different length wiper transmission arms?

Thanks!

 

[John_Muha]

Maybe one of the 65 guys will show up. Still can't get at some of my notes with the home computer problems.

 

[Philip]

The round and square wiper motor arms (all 3) are different from each other. I think I have an extra set of the square motor type in a box buried in storage. If you can't find any email me and I'll start digging for them.

 

[SNFU Mobile]

Hey John - we need to get your computer fixed! I'm in an electrical quandry down here without your knowledge!

I know you're not that far away from me, and I'm pretty computer savvy - so if you need some help man, I'd be more than willing to come up and lend a hand!

 

[Rich-L79]

I'm not sure I can exactly address the wiring question, but when you use the round two-speed motor you do need to also obtain the auxillary wiring harness. Part of it connects directly from the special two-speed/washer switch and connects directly to the wiper motor. Then the main harness plug connects to this aux harness. I'd have to look at mine again to be more specific but if you don't have this extra harness you will never get it to work properly.

 

[John_Muha]

Well it's a matter on getting at some files. Working on it. If you can use a part off the transmission I have, I'll send it down. Beats me why I saved the thing. Just need a good desciption to see if I have the right one.

 

[SNFU Mobile]

I believe I've located the transmission, I'll let you know if I haven't.

And seriously - if you need any help, let me know, I'd be more than happy to lend a hand.

I'm still puzzled by the electrical problem I'm having, and will continue to "experiment" today.

 

[SNFU Mobile]

"I have a rotary style switch for 64-65-66 . It is a grounding type switch. It has three terminals. It grounds one for the washer. Of the other two, both are grounded for low and one is grounded for high. Nothing grounded for off. These years use a seperate harness for the wiper motor. if you can score a switsc, motor, and harness off the same car, the motor should bolt on. just run an ignition hot to the wiper harness, and your good to go! GOOD LUCK, STAN "

I found this while searching. Pretty sure this is exactly what I was experiencing before. I will go do some "experimenting" now down in the shop here at work, and let you guys know what I find. I'm pretty sure Stan "The Man" is right. His nickname on here is Stan65

 

[SNFU Mobile]

Okay, I've got it - with the switch information and everything, it helped sort it out. I believe this wiring is different from the other 4 terminal wiring that has been described before.

Now, my question is, will a diode work to isolate a ground? Diodes stop current flow, so I imagine it will work. I made up a little wiring diagram, and I think this will work - can anyone confirm this for me?

 

[Elree Colby]

pic

Just to muddy up the water.

The switch on the left is, I believe for 65, the right is for 66. Which switch if either do you have. The switch on the left grounds one motor lead when the switch is in OFF and LOW, the other is grounded when in LOW and HIGH. The switch on the right grounds one lead when in LOW only, the second is grounded in LOW and HIGH. On both the third is grounded when pushed for wash cycle.

There is a harness with the left switch, it's the 65 optional 2 speed harness. The motor connector has the power in the middle the two outside wires connect to the switch. The point is that the motor with 4 terminals as you stated has the power applied to the terminals on one side. I found the 4 terminal motor in a 66 repair manual. The switch function is different for the two motors as is the motor wire connections.

I do have a third switch that is for 64 it's the same as the 56 except the lugs are keyed such that he connector is upside-down compared to the way it connects to the 65 switch. It also grounds the same as the 65. One lead grounds in OFF and LOW, The other grounds in LOW and HIGH.

 

[SNFU Mobile]

Elree - awesome information.

I actually don't have either of those switches, since I totally re-wired my car with a Painless kit, and used their wiper switch.

Basically, their swtich has an input (which will be directed to ground) and then connects that input two 1 of 2 output terminals when you rotate it. The first one is for "low" speed, and the second is for "high" speed. Like in your switches, there is another one for when you push the button in to make the washer pump squirt.

I'm thinking that my setup will work, I'm going to stop by a Radio Shack on my way home today and pick up some diodes and give it a shot. I'll let everyone know how it goes.

 

[John_Muha]

Just thinking
Have you tried mounting the motor up or is most of this just a bench test? Sounds like you are just disconnecting the return or ground lines and expecting the motor to park.

 

[SNFU Mobile]

Yeah, I actually mounted the motor, and made sure the grommet with the ground strap on it had a good solid ground.

I made up the wiring like in my little diagram, used a IN5404 diode I picked up from Radio Shack, and bam - thing works great. It doesn't always park, I think because it keeps going past the park position because there's no resistance on the motor right now since I don't have the wiper transmission hooked up to it, so the motor just kinda "cruises" past the park position, even though I can hear it disengage. It only does this sometimes. Did that make sense? It's like it goes to the park position, but then drifts by because there is no load on the system, and then attempts to park the motor again.

Anyhow - hope that helps. And, thanks for all the help guys!

 

[Elree Colby]

"Did that make sense? It's like it goes to the park position, but then drifts by because there is no load on the system, and then attempts to park the motor again."

I agree, with the trans and wipers connected it should stop in the park position.