Wipers normally have 12 volt power all of the time. The wiper switch supplies the ground. When turned off the parking switch keeps the wipers moving until they reach the park position. I am betting it is the parking switch in the motor.
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If you built it, drive it.
red 62 Tempest total stock restoration.
white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train.
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