Electrical Engineers I need your help!
#60370
05/20/08 04:14 PM
05/20/08 04:14 PM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: Got2Gnow]
#60371
05/20/08 08:29 PM
05/20/08 08:29 PM
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Joined: May 2004
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DartGTDan
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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
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Re: Electrical Engineers I need your help!
[Re: DartGTDan]
#60372
05/20/08 09:39 PM
05/20/08 09:39 PM
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PHJ426
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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/27458Try 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.
Last edited by PHJ426; 05/20/08 09:43 PM.
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Re: Electrical Engineers I need your help!
[Re: PHJ426]
#60373
05/21/08 10:47 AM
05/21/08 10:47 AM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: Got2Gnow]
#60377
05/21/08 10:35 PM
05/21/08 10:35 PM
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Ronnman
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Quote:
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
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Re: Electrical Engineers I need your help!
[Re: Ronnman]
#60378
05/23/08 06:58 PM
05/23/08 06:58 PM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: Ronnman]
#60379
05/23/08 07:06 PM
05/23/08 07:06 PM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: Ronnman]
#60381
05/24/08 12:43 AM
05/24/08 12:43 AM
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Joined: Jan 2003
Posts: 1,547 Puyallup, Wa.
Steve340
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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.
Last edited by Steve340; 05/25/08 02:24 PM.
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Re: Electrical Engineers I need your help!
[Re: Ronnman]
#60382
05/24/08 09:33 AM
05/24/08 09:33 AM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: PHJ426]
#60385
05/26/08 09:57 AM
05/26/08 09:57 AM
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Got2Gnow
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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
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Re: Electrical Engineers I need your help!
[Re: Got2Gnow]
#60386
05/27/08 06:16 PM
05/27/08 06:16 PM
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Got2Gnow
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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
Last edited by Got2Gnow; 05/27/08 06:21 PM.
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Re: Electrical Engineers I need your help!
[Re: Got2Gnow]
#60387
05/27/08 10:36 PM
05/27/08 10:36 PM
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PHJ426
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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
Last edited by PHJ426; 05/27/08 10:39 PM.
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Re: Electrical Engineers I need your help!
[Re: PHJ426]
#60388
05/28/08 07:00 PM
05/28/08 07:00 PM
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Got2Gnow
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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
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