Re: Why are wiper motors switched ground?
Possibly because multiple functions of a device are easier to control using a common ground rather than running several live wires and switches. The same holds true with the dome light and the ground switches that turn it on. I think mainly it was cheaper for the factory to do it that way.
The blower motor is an example of using positive switching for different speeds but the speeds are designed by using resistors instead of separate windings in the blower motor.
Just my theory but a very interesting question.
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VetteVet
metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide
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