The car has 2 speed wipers. There are 3 wires at the wiper motor. One is live with the key in "ACC" and "IGN". 2nd grounds through the wiper switch. At this time I don't know where the 3rd goes. I installed a relay as a test with power and feed to 12 volts, output to lights and ground to wiper switch. All worked well with the wiper motor unplugged. When I plugged the connector into the motor the lights wouldn't go out. Evidently the relay would ground through the motor windings.
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