Thread: Rocking granny wiper motor just a little slow

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I have been at this problem for a while. I had purchased a DC motor speed control and it blew up and can't seem to get it to work properly again to control the speed of the wiper motor. I have a PC power supply, 12V was to fast 5 volt was to slow, I have a plug that is putting out 7V DC and 1.6amps and it is just a little slow for the rocker to rock properly, it is close to 24rpm's.


I am looking for suggestions to figure out how to make it work properly, would shortening the crank arm or linkage arm help the problem. I looked at a 6V/12V battery charger but that would cost me another $40.

Shortening the arm will only make the throw that much smaller... it won't change the speed. Check which wires on the wiper motor you are using. One is the slow speed and one is typically high speed. Perhaps using the high speed wire, but with the 5 Volt supply, will get you closer to the speed you are looking for. Otherwise, I would suggest an inexpensive DC motor speed controller. Not sure why the one you had blew up.

I've tried switching the wires on the motor but cannot get the speed to change, the only thing that can happen is when I switch the black and the white from their current position to the opposite positions the motor goes in reverse. The motor only has 4 prongs and only has 2 wires coming out from the bottom, whit eand black. I have attached a picture of the motor

Usually, the body of the motor itself is one of the wired, given that most automotive wiring uses the chassis of the car for ground. Of the four wires, *usually* they are low speed, high speed, park in and park out. I won't go into the grizzly details of the park function here, but have you tried connecting a wire to the body of the motor (for "ground") and then using either the black or white wires to see if you get any action at all? My guess is you're using both the low and high speed wires and are probably getting a low speed result.