Please look at the attached diagrams. I have a 1971 Dart Swinger that I want to update the Wiper/Washer switch (for a custom dash).
The original switch will, hopefully, be replaced by 3 toggle switches if my schematic/logic is correct.
In the attached file the original switch and wiring is on the top portion of the drawing. The modified switches are on the bottom portion of the drawing.
Please let me know if this looks like it will work.

Thanks,

Got2Gnow

Got2Gnow,

Looks OK to me, but I'm not an Elec. Engr.
Is there maybe an aftermarket switch you could use? Anyone? Maybe a hotrod shop?

Here's a bump

Why use 2 switches for the speed of the wiper motor?

With your design you could have the motor energized in the low and high speed at the same time.

You will need more relay interlocking in the circuitry or aux contacts from the switches to prevent that from happening.

You covered the Park / Run deal but the 2 seperate switches for the speeds can be a problem.

Is it possible to incorporate the factory switch or will in not fit on the new dash deal?

If your looking for a new look maybe use the old switch and a new knob?

Do a Google search on Double Pole Triple Throw switches and there are a bunch that come up here is one of them:

http://news.thomasnet.com/fullstory/27458

Try www.mauser.com for an elecrtronics supply house that has switches for 12VDC.

Im an Electrical Instrument Testing Mechanic by trade. Not an Engineer but I have helped a few out with some problems in the last 20 years in the Electrical controls / Instrumentation field.

Paul,

Yeah, I thought I might have the motor going at "high" and "low" at the same time.
Do you see a way around that?
I suppose I could find a 2-deck, 3-position, rotary switch for the motor's "wipe" speeds, and a separate momentary pushbutton/toggle for the "wash" function, thereby repeating what the factory has done.
I was trying to use 3 toggle switches to match the look I've come up with for the park/head/dome lamp switch system.
I'm open to other opinions/help/designs

Thanks a million!

Got2Gnow

best bet is to find a wiper switch for a mopar with 2 speeds- e body may not work as they are a hidden style- abody or b body is best!

Post a drawing of the dash I would like to see the layout of the switches and gauges.

I would do what PHJ426 said and get relays with additional logic (more open and closed contacts) to them to prevent having the low and high speed on at the same time. Everything else looks like it would work. Really, getting a relay with additional contacts should be fairly easy. Look in a Grainger catalog or just go to your nearest Grainger or electronic store and ask for a 12VDC activated coil with DPDT contacts. They will hook you up. Then wire your switches into the relays so that if the low is on the High never comes on or visa versa.

-Don

Quote:

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Yeah, I thought I might have the motor going at "high" and "low" at the same time.
Do you see a way around that?

---

Yes, you could supply the +12vdc to the low speed relay contacts from the normally closed contact set on the high speed relay. That way whenever your high speed relay is energized the low speed will not have +12vdc. There have been some other good suggestions here as well.
Ron

PHJ426,

Thanks for the help.
Attached is the layout plan for the RedLine dash insert.
If I get the 3 LOW/HIGH/WASH wiper toggle switches to work (see next post) it should match the 3 PARK/HEAD/DOME lamps toggle switches real well.

Got2Gnow

Ronmann,

Thanks to you for your help as well!
I stared at my original plan for hours and could not see ANY way to do it. Duh!!
Attached is your new plan (with the factory stuff on top).
I believe it should be dead on now, but please look it over and see if you agree!

Thanks, Moparts Members Always Come Through!

Got2Gnow

Got2Gnow you are welcome. I just looked at you new schematic, you did what I suggested. But, I see a possible flaw in the working. What happens when you have the high switch closed and the you change the DPDT switch to park. I think it would park using the high speed. You would have to make sure to turn off high and then change from low to park. Or another possible fix to this would be to supply the +12vdc to the run terminal of the parking mechanism from that same NC contact on the high speed relay. I do not remember exactly how the 2-speed motors park. Do you know the exact action of the park mechanism. If you do not find out I would remove the wiper arms from the pivots and try the system out.
Ron

To keep from energizing high speed when the other switch is in the park position, you could supply the high speed switch from the low speed switch output. In other words, the other side of the low speed switch that supplies the low relay power. One thing your forgetting is that you have no motor "brake". The park position stops the motor very fast by shorting the both low input and ground leads together. That is why there is a ground position on the park switch, otherwise the motor will coast to a stop.

Ronnman,

I think if I use the 3 toggle switches in the same sequence, as the factory rotary switch was designed, I should be OK.
That is to say:

1. From a wiper motor OFF/PARK position to LOW speed (rotate factory knob ClockWise one position, or toggle the LOW switch to the ON/UP position.

2. From a wiper motor LOW speed position to HIGH speed (rotate factory knob ClockWise one position, or toggle the HIGH switch to the ON/UP position (also leaving the LOW toggle ON/UP)).

3. From a wiper motor HIGH speed position to LOW speed (rotate factory knob CCW one position, or toggle the HIGH switch to the OFF/DOWN position).

4. From a wiper motor LOW speed position to OFF/PARK (rotate factory knob CCW one position, or toggle the LOW switch to the OFF/DOWN position).

Do you agree?

Got2Gnow

Got2Gnow - Steve340 has provide the information I did not know. Steve340 I am not follwing you on your low/high speed relay comments. Please provide more explaination.

Got2Gnow - Your sequence of operation will work. But you need to incorporate the wiper park connection. You could separate the wire from the park side of the DPDT and run directly to the low speed terminal of the wiper motor. This should accomplish the wiper "park mode" as Steve340 explained.
Ron

Got2Gnow -

If you are persistant on utilizing 2 DPDT switches for the wiper motor do it like this:

Switch One is for On - Off or On - Park Only.

This switch when in the On position will send a power feed to the Low - High Speed switch

This switch when in the Off or Park position will remove power feed from the Low - High Speed switch and will ground the motor to send it to Park.

For the On Off or On Park switch use the normally open contact to feed power to the common terminal of the Low High Speed Switch. And use the normally closed contact for the Park position.

For the Low High switch use the normally closed for the Low speed and the normally open for the High speed.

There I think we have this problem solved now.

No extra relays required (If the switch can handle the power of course), No possiblity of the motor being in Low and High at the same time and better even no possibility of the motor being in Park or High at the same time also.

Let me know what you think of that design.

Good luck and keep us posted.

PHJ426,
Thanks for the help thus far. I'll try to redraw the circuit with your recommendations on Tuesday at work (I'm heading out the door for the holiday festivities).
I'll try to post the updated schematic Tuesday evening.
Thanks,

Got2Gnow

PHJ426 & Ronnman,

I redrew the attached circuit as promised.
I now have questions regarding the ON/OFF (ON/PARK) switch. In your previous post you said I should ground (GREEN LINE on drawing) the 2nd pole of that switch. In looking at the original/stock wiring, don't I want the 2nd pole to be a +12V feed (RED LINE on drawing) when the LOW/HIGH switch is in the LOW position?

Please let me know your thoughts!

Got2Gnow

Okay your almost there with the schematic.

After reviewing the factory drawing it looks as the wiper motor needs power from the 16PK wire to send the motor to the park position. We can fix that as follows:

1. Remove the ground jumper from the On Off top switch section.
Replace that ground with the 16PK as in the factory wiring.

Remove the jumper that runs from the same electrical point (on the On Off switch) (where you removed your ground above) to the second switch for the High Low speed selection.

2. On the relays for the Low High speeds wire them as listed below:

Low Speed switch output 18RD wire to Low speed relay coil point 86 and ground to point 85

Low Speed relay Run the fused 12V power to point # 30.

Low speed relay output to Low speed on motor on point # 87


High Speed switch output 18GN wire to High speed relay coil point 86 and ground to point 85

High speed relay Run the fused 12V power to point #30

High speed relay output to High speed on motor on point #87

Redo the drawing like that and I think we have a keeper

PHJ426,

OK I redrew the schematic based on your last post (I should have fixed the relays on the previous drawing, but was more interested in the wiring to the switches).
I'm still not clear on why I need the 16PK wire run to the top pole of the ON/OFF Switch #1 (thick RED wire on the new drawing).
I would think, to mimic the factory wiring, I should run a wire from the top pole of the ON/OFF Switch #1 to the Motor Low Speed feed (thick VIOLET wire on the new drawing).
Please advise, again.

Thanks,

Got2Gnow

That is a good point on the violet wire.

Here is what I do not know about the wiper motors and maybe someone here will clear it up for us.

Where is that switch located that is pictured in the schematic above the motor with the park and run positions.

This might be the point where we need to start bench testing and seeing what works and why and why not.

I can see in the factory application where the DPTT double pole triple throw switch is using the thin violet wire to bring power thru the low speed side of the motor to park it.

Can you test your motor out with a 12v battery and some test jumpers to determine where this 3rd switch above the motor in the schematic is located physically.