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The three wires are the ground wire, the hot wire that runs through the switch and is energized only when the switch is in the on position and the third wire which is energized anytime the ignition switch is on. This circuit allows the wiper arm to go to the "park" position when you turn the wiper switch off. If you turn the ignition switch off while the wiper is in operation it will stop immediately and not continue to the "park" position. When the ignition switch is turned on again, the wiper will return to "park".

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Q: The rear wiper motor for your 1997 Jeep Wrangler Hardtop has three wires When you connect only two to a switch you are able to operate the wiper Why are there three wires?
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