Home » Public Forums » GMCnet » Re: [GMCnet] electric wiper speed control
| Re: [GMCnet] electric wiper speed control [message #204069] |
Mon, 08 April 2013 16:02  |
Steve Jess
Messages: 169
Registered: April 2012
Karma: 0
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Senior Member |
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Just a thought: while looking for replacement HVAC controls for the DreamLiner, I discovered that the A/C Panel for the 87-96 Jeep Cherokee uses a wheel for the fan speed control, similar to the layout you are talking about. Maybe one of those controls - or even the lever/paddle style fan switch that comes on our GMCs - could be re-purposed as a wiper speed control? Granted it's a three or four position switch, not a true potentiometer, but it would probably give you as much control as you want.
Steve Jess - Boise, ID
1977 GMC Palm Beach "The DreamLiner"The 10,000 pound antique Home Theater with plumbing - and the batteries don't catch fire, either.
> Message: 17
> Date: Mon, 08 Apr 2013 14:29:58 -0500
> From: Steve Southworth <midlf@centurytel.net>
> Subject: Re: [GMCnet] electric wiper speed control
> To: gmclist@temp.gmcnet.org
> Message-ID: <31d1b.51631ab6@gmc.mybirdfeeder.net>
> Content-Type: text/plain; charset="ISO-8859-15"
>
>
>
> Ken Henderson wrote on Mon, 08 April 2013 08:10
> > Steve,
> >
> > The closest change I've seen to what you propose was done by the retired
> > chief engineer for Textronics. He mounted a standard rotary potentiometer
> > with its shaft parallel to the dash panel with a large flat circular knob
> > extending through the dash slot -- a thumbwheel, in other words.
> >
> > 'Way back I did look for a linear pot. like you suggest, but never found
> > one that could be mounted easily.
> >
> > Ken H.
>
>
> Hmmm - thumbwheel. That's an idea.
>
> Yeah - the mounting is the problem. Most ways I can find to mount one require an extension of the handle. I'm sure it can be done, but how much of a PITA will it be. It seems sorta silly to go get into a puttsy machine shop project to mount a simple linear pot.
>
> I gotta get this thing on the road so maybe for now Col Ken's rotary pot will just have to hang under the dash from it's wires.
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI
>
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| Re: [GMCnet] electric wiper speed control [message #204070 is a reply to message #204069] |
Mon, 08 April 2013 16:06  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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The only problem might be that it is just a switch and that you would have to put the resistance coils (such as in the GMC heater box) to drop the voltage for each switch position. These coils produce a lot of heat which is why they are in the heater box where they are cooled by the moving air from the fan motor.
Emery Stora
On Apr 8, 2013, at 3:02 PM, Steve Jess wrote:
> Just a thought: while looking for replacement HVAC controls for the DreamLiner, I discovered that the A/C Panel for the 87-96 Jeep Cherokee uses a wheel for the fan speed control, similar to the layout you are talking about. Maybe one of those controls - or even the lever/paddle style fan switch that comes on our GMCs - could be re-purposed as a wiper speed control? Granted it's a three or four position switch, not a true potentiometer, but it would probably give you as much control as you want.
>
> Steve Jess - Boise, ID
> 1977 GMC Palm Beach "The DreamLiner"The 10,000 pound antique Home Theater with plumbing - and the batteries don't catch fire, either.
>
>> Message: 17
>> Date: Mon, 08 Apr 2013 14:29:58 -0500
>> From: Steve Southworth <midlf@centurytel.net>
>> Subject: Re: [GMCnet] electric wiper speed control
>> To: gmclist@temp.gmcnet.org
>> Message-ID: <31d1b.51631ab6@gmc.mybirdfeeder.net>
>> Content-Type: text/plain; charset="ISO-8859-15"
>>
>>
>>
>> Ken Henderson wrote on Mon, 08 April 2013 08:10
>>> Steve,
>>>
>>> The closest change I've seen to what you propose was done by the retired
>>> chief engineer for Textronics. He mounted a standard rotary potentiometer
>>> with its shaft parallel to the dash panel with a large flat circular knob
>>> extending through the dash slot -- a thumbwheel, in other words.
>>>
>>> 'Way back I did look for a linear pot. like you suggest, but never found
>>> one that could be mounted easily.
>>>
>>> Ken H.
>>
>>
>> Hmmm - thumbwheel. That's an idea.
>>
>> Yeah - the mounting is the problem. Most ways I can find to mount one require an extension of the handle. I'm sure it can be done, but how much of a PITA will it be. It seems sorta silly to go get into a puttsy machine shop project to mount a simple linear pot.
>>
>> I gotta get this thing on the road so maybe for now Col Ken's rotary pot will just have to hang under the dash from it's wires.
>> --
>> Steve Southworth
>> 1974 Glacier TZE064V100150 (for workin on)
>> 1975 Transmode TZE365V100394 (parts & spares)
>> Palmyra WI
>>
>
>
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| Re: [GMCnet] electric wiper speed control [message #204077 is a reply to message #204070] |
Mon, 08 April 2013 16:53 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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T. Lins did this. The resistors do not drop load current but provide a signal to the wiper motor control board. 2 watt resistors would probably be overkill.
If the resistors had to drop wiper motor current then, yes, they would produce a LOT of heat.
SteveS
START QUOTES
| emerystora wrote on Mon, 08 April 2013 16:06 |
The only problem might be that it is just a switch and that you would have to put the resistance coils (such as in the GMC heater box) to drop the voltage for each switch position. These coils produce a lot of heat which is why they are in the heater box where they are cooled by the moving air from the fan motor.
Emery Stora
On Apr 8, 2013, at 3:02 PM, Steve Jess wrote:
> Just a thought: while looking for replacement HVAC controls for the DreamLiner, I discovered that the A/C Panel for the 87-96 Jeep Cherokee uses a wheel for the fan speed control, similar to the layout you are talking about. Maybe one of those controls - or even the lever/paddle style fan switch that comes on our GMCs - could be re-purposed as a wiper speed control? Granted it's a three or four position switch, not a true potentiometer, but it would probably give you as much control as you want.
>
> Steve Jess - Boise, ID
> 1977 GMC Palm Beach "The DreamLiner"The 10,000 pound antique Home Theater with plumbing - and the batteries don't catch fire, either.
>
>> Message: 17
>> Date: Mon, 08 Apr 2013 14:29:58 -0500
>> From: Steve Southworth <midlf@centurytel.net>
>> Subject: Re: [GMCnet] electric wiper speed control
>> To: gmclist@temp.gmcnet.org
>> Message-ID: <31d1b.51631ab6@gmc.mybirdfeeder.net>
>> Content-Type: text/plain; charset="ISO-8859-15"
>>
>>
>>
>> Ken Henderson wrote on Mon, 08 April 2013 08:10
>>> Steve,
>>>
>>> The closest change I've seen to what you propose was done by the retired
>>> chief engineer for Textronics. He mounted a standard rotary potentiometer
>>> with its shaft parallel to the dash panel with a large flat circular knob
>>> extending through the dash slot -- a thumbwheel, in other words.
>>>
>>> 'Way back I did look for a linear pot. like you suggest, but never found
>>> one that could be mounted easily.
>>>
>>> Ken H.
>>
>>
>> Hmmm - thumbwheel. That's an idea.
>>
>> Yeah - the mounting is the problem. Most ways I can find to mount one require an extension of the handle. I'm sure it can be done, but how much of a PITA will it be. It seems sorta silly to go get into a puttsy machine shop project to mount a simple linear pot.
>>
>> I gotta get this thing on the road so maybe for now Col Ken's rotary pot will just have to hang under the dash from it's wires.
>> --
>> Steve Southworth
>> 1974 Glacier TZE064V100150 (for workin on)
>> 1975 Transmode TZE365V100394 (parts & spares)
>> Palmyra WI
>>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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END QUOTES
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] electric wiper speed control [message #204102 is a reply to message #204077] |
Mon, 08 April 2013 18:55 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Right, 1/2 W resistors are overkill. The maximum current the delay circuit
can draw is 18 mA, as limited by a series 680 Ohm resistor hidden in the
gray wire of the harness.
Ken H.
On Mon, Apr 8, 2013 at 5:53 PM, Steve Southworth wrote:
>
>
> T. Lins did this. The resistors do not drop load current but provide a
> signal to the wiper motor control board. 2 watt resistors would probably
> be overkill.
>
> If the resistors had to drop wiper motor current then, yes, they would
> produce a LOT of heat.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] electric wiper speed control [message #204108 is a reply to message #204102] |
Mon, 08 April 2013 19:50 |
Michael Morton
Messages: 21
Registered: July 2004
Karma: 0
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Junior Member |
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I did just this. I got a wiper motor and switch and intermittent box from a Ford van at the men's mall. The intermittent box is just hanging behind the instrument panel and attached to the switch by the wiring. Best I can remember it was from an 80s' model van. Got it all with all the wiring for 25 bucks. The switch mounted easily with only 1 hole needing to be drilled as best I remember. The hardest part was modifying Ken H's mount to accept the ford motor. Had to weld a small extension to the bottom of it so it would be long enough for the mounting holes. The switch slides up and down in the same slot as the original and you push for window washers. Works great and the washer hole I used for an electric fuel pump switch.
Mike Morton
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