Does anyone know the wiper motor knows to speed up when put on high? Does putting the wiper speed to high supply more voltage than when its on low? Just curious as to how the motors work.

 

High speed is full voltage, Low speed is less voltage...

 

The wiper motor uses full voltage on all speeds. The switch just sends a ground signal to the board for high & low. The switch sends out a resistance to the wiper circuit board for delay setting.

 

There's a voltage dividing resistor somewhere in there...

 

Hi Gents ,

To clear up a bit of confusion here , a quick look at this schematic for 1992 (earlier models are similar enough for this explanation) will reveal that there are no dropping resistors involved in the two different wiper speeds , the wiper motor itself has two sets of windings , one each for low and high speed . Notice the wiper motor itself has three connections ? One is common , with the other two being the low and high speed windings .

Now , your heat - A/C motor does use a multi tapped dropping resistor , but your wiper motor receives full system voltage on both speeds , with the speed determined by which motor winding is selected .

 

Thanks, OrangeBird. I stand corrected...

 

Thank you for editing your earlier misinformation regarding the dropping resistor , but you still don't have it right . If you look at the schematic I posted , the switching of speeds happens on the positive side of the circuit , and not on the negative side .

 

I'm happy to have helped . That's the great thing about this board , while we all can't possibly know everything , there are enough of us who know something about the different areas of our cars that we have pretty much all the info handy right here . I , for instance , know nothing of what cam works best with what intake manifold , but being an electronics expert I know pretty much every electrical component of our cars . Others know bodywork , others still know history/options , and together we got it all covered .

 

So would using a step up converter to 19v on the high speed wire make the blades faster?

 

The short answer is , yes , increasing the voltage will make the motor run faster .

BUT ! , I have no idea as to the voltage tolerance of that motor , and wouldn't want to hazard a guess as to how long it would survive being subject to an over voltage condition ......

 

Sorry It was last year I was diagnosing issues with the motor and testing the inputs, I thought it was ground signal but that was last year lol. I just remember both high and low were full voltage and not stepped down for low speed.

 

No problem , as you can tell I am not one to scold or taunt someone for being fuzzy on the facts . I just figure if we are mistaken we owe it to future readers to get it right , so as to not be leading someone down the wrong diagnostic path .

 

okay I am gonna try a step up converter to 19v on the high speed and see what happens. Just gotta figure out how many amps it needs. I am too use to wiper blades on modern cars that move at warp speed