wiper motor park

["Ed & Marsha Prytherch" <mred2u@domain.elided>]

I think that the wire you describe as always hot is only hot when the wiper
switch is in the OFF position. A wire off at the switch, or a defective
switch, could also be the problem.

Ed Prytherch
79 Spider
73 GTV

>Typically, a wiper motor has a park disk or device inside which parks the
motor in a specified position after the main wiper motor voltage has been
released.  This takes place via an additional 12V wire (which is always hot
when the igntition is turned on- I don't think the ignition needs to be on
in this car to run the wipers though) which continues to run the motor until
the wipers are in the desired position (or at least the wiper motor crank
is!) at which point the circuit opens, power is cut, and the motor
dynamically brakes itself.  This typically is driven on the low speed brush
of the motor (opposed to the high speed brush).
...- -Jason Hagen
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