NSEU, you got me thinking...
For the Rosemount wiper motors P/N 2313M-248-1 and -2, I found in CMM 30-40-01:
"Converter Assembly
The converter assembly reduces the speed of the rotary output of the motor assembly and converts it into an oscillating motion for driving the wiper arms and blades back and forth across the windshield.
During the OFF (Park) cycle, the motor reverses, which makes the converter
mechanism reverse direction. When this happens, a parking eccentric (working with the driven and driving cams and a wrap spring) changes the wiper pattern to allow the off-pattern parking of the wipers. "
and
"OPERATION
The pilot and copilot each have individual control over their motor-converter assembly by means of separate control switches that can be set to HI, LO, or OFF. The field coil of each electric motor is wound in two segments. When the control switch is set to HI, the two motor windings are connected in
parallel, which provides maximum motor revolutions. When the control switch is set to LO, the two motor windings are connected in series. I
n the OFF position, the motor will operate at low speed and simultaneously reverse its direction of rotation until a mechanism in the converter changes the wiper
pattern to park its wiper blade in its off-pattern position. When park position is reached, a trigger- actuated switch in the converter will remove all electrical power from the motor (see Figure 2). "
Hope this helps!
Cheers J. V.