Wiper Motor

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Apr 16, 2007 | 06:10 PM

john061543

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From: Grapeview, WA

Wiper Motor

I want to use my 6 volt wiper motor, with a reducer, in my 12 volt system - 1955 F100.

Does anyone know the amp rating of the wiper motor, as this determines the size/quantity of reducers I need to use?

Thanks, John

Apr 16, 2007 | 08:22 PM

ALBUQ F-1

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From: NM

I would count on 10 amps. It will take a heck of a reducer to handle that; you may want to use it for cab heat! Seriously, many have tried, I don't know of any successes.

Apr 19, 2007 | 03:52 AM

49willard

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From: Harpswell Maine

Quote:

Originally Posted by ALBUQ F-1

I would count on 10 amps. It will take a heck of a reducer to handle that; you may want to use it for cab heat! Seriously, many have tried, I don't know of any successes.

I ran the 1952 6 V electric wiper setup in Willard on 12 v for years ( and I am going back to that setup) with a large dropping resister specifically for the wiper motor . It is a large wound ceramic style power resister that is adjustable. It is an Ohmite #0956A 1 ohm 100 watt resister. ALBUQ is correct, it provides auxilliary heat! The resister has a slide contact to allow adjustment. I have it adjusted for about .75 ohm which gives me about 7 V at the wiper terminals with the wiper operating. Don't ask me where I got it. I bought it just about 30 years ago! You would have to find a place selling large power resisters (not Radio Shack). The resister is about 6 inches long and 7/8" in diameter. It is a hollow tube style.
I am going back to it after trying to quiet down a setup that I fabbed using a 12v VW setup. The dash in Willard functioned as a drum amplifying the sound of the wiper motor after many sound isolation attempted fixes. I needed the compact size of the 6 V setup with my behind the dash Heat/ AC unit with ducts.

EDIT
I just did a google search. Believe it or not the one that I have is on Ebay #7588203651. It worked 30 years ago and it works now!

Last edited by 49willard; Apr 19, 2007 at 04:21 AM.

Apr 19, 2007 | 06:13 AM

GreatNorthWoods

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From: Littleton, New Hampshire

Just thinkin' out loud here, but I wonder if a heater rheostat would work for a wiper motor? I ran a 6V heater in a 12V car for many years. Of course you have no low speed because the low setting becomes medium and you can't run it on high else you put the entire 12V on the motor. If it will work for a heater motor maybe it would work for a wiper motor. I have no idea how the current draw compares but my guess is the heater motor would draw more.

Apr 19, 2007 | 07:07 PM

john061543

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From: Grapeview, WA

49willard - Thanks for the info and the ebay link. I bought the Ohmite resister and will give it a try.

Thanks again, John

Apr 20, 2007 | 08:49 AM

scottjo

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Joined: Aug 2005

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From: East Liberty, OH

Ok,

So I'm not quite up on my wiring but according to 49willard if I would get a resistor with 100-300 watt rating that has a .75 ohm resistance and wired it up to my windshild wiper I could run my 6 V wiper motor on the 12 V system in my truck. Because I'm going to order a resistor and I want to get the right thing the first time.

Thanks
-Scott

Apr 20, 2007 | 10:35 AM

reamer

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From: Connecticut

Why not just buy a Dennis Carpenter 6v or 12 Wiper system and be done with it?

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Apr 20, 2007 | 11:01 AM

49willard

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Joined: Apr 2005

Posts: 3,337

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From: Harpswell Maine

Quote:

Originally Posted by reamer

Why not just buy a Dennis Carpenter 6v or 12 Wiper system and be done with it?

Reamer, In my case (for an F-1) the available setups that I have seen would interfere with my AC/heat. I am not as familiar with the setup on the F-100.

The advantage of the adjustable power resistor over a fixed resistor is that you can dial in the running voltage with a bench test by making an adjustment on the resister and then running the wiper motor briefly while observing the voltage at the connection to the wiper motor. You need a volt meter that reads in the 6 to 12 volt range to set it correctly. I am going to run it at about 7 v. which speeds up the wiper a bit on high or low speed but is acceptable for the motor.

Last edited by 49willard; Apr 20, 2007 at 11:04 AM.

Apr 20, 2007 | 01:21 PM

#10

scottjo

Senior User

Joined: Aug 2005

Posts: 129

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From: East Liberty, OH

I was looking for an adjustable resistor. I just wanted to make sure that I was looking for one that will be able to do the .75 ohm @ 100+ watts. I do have the multimeter and it shouldn't be any probelm to dial in the resistor to the wipers after they are running.

-Scott