6v wiper motor - need switch
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Senior User
Joined: Oct 2003
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From: Lewisville, NC
6v wiper motor - need switch
I found a working 6 volt wiper motor to replace my vacuum system. Didn't have the switch with it. I'm using 12v neg ground now and have a 12-6 volt converter that I built to run the gauges.
Anybody know where to find the switch for this at a reasonable price?
How much amperage does the wiper motor pull?
If I can't find the switch, does anyone know how it works and interacts with the motor? The motor has some kind of wound wire resistor across the two motor leads - why?
-Scott
Elvis - '53 F100 with Merc 255 flathead
Anybody know where to find the switch for this at a reasonable price?
How much amperage does the wiper motor pull?
If I can't find the switch, does anyone know how it works and interacts with the motor? The motor has some kind of wound wire resistor across the two motor leads - why?
-Scott
Elvis - '53 F100 with Merc 255 flathead
Cargo Master
Joined: Apr 2005
Posts: 3,337
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From: Harpswell Maine
Way back I ran the same setup as you are trying to run. i.e. the 6v wiper on 12v. I ran the wiper motor on 6 v with my 6v/12v battery charger to get the amperage draw (charger has a built in amp gage and you should check the voltage out of the charger at the same time and make sure it isn't to high-say more than 13 v). Then I bought a power resister sized by E=IR. I think I still have the power resister somewhere but am not sure which one it is since separately I also did the same thing to run an original heater motor on 12v. Your gages dropping resister is most likely incorrectly sized for the wiper motor power demand.
Incidently, the setup worked well for years.
Incidently, the setup worked well for years.
Thread Starter
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Senior User
Joined: Oct 2003
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From: Lewisville, NC
That approach would give you a dropping resistor to go 12v - 6 v at the current draw of the motor and should work well. I've already built a 10a 12v-6v converter to run the gauges + ? so unless the wiper motor pulls for than 5 amps or so, that should be good to go.
How does the wiring of the switch and motor interact? I assume this is a two speed motor because of the three wires, but how does it wire up through the switch and does the switch do anything except switch (i.e. put a resistor in the switch inline?)
-Scott
How does the wiring of the switch and motor interact? I assume this is a two speed motor because of the three wires, but how does it wire up through the switch and does the switch do anything except switch (i.e. put a resistor in the switch inline?)
-Scott
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
Originally Posted by Narwhal
That approach would give you a dropping resistor to go 12v - 6 v at the current draw of the motor and should work well. I've already built a 10a 12v-6v converter to run the gauges + ? so unless the wiper motor pulls for than 5 amps or so, that should be good to go.
How does the wiring of the switch and motor interact? I assume this is a two speed motor because of the three wires, but how does it wire up through the switch and does the switch do anything except switch (i.e. put a resistor in the switch inline?)
-Scott
How does the wiring of the switch and motor interact? I assume this is a two speed motor because of the three wires, but how does it wire up through the switch and does the switch do anything except switch (i.e. put a resistor in the switch inline?)
-Scott
If you try to run the wiper thru your existing gage dropping resister, check the voltage going to the wiper switch on the initial test. I would limit voltage to the wiper motor to less than 7 volts with the truck running to minimize the potential for damage to the wiper motor.
