2003 Ford Expedition Transmission Cooling Wiring
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9.With the cooler in place, we began wiring our electric fan and switch. We pulled 12-volt ignition from an unused diagnostic plug, located right behind the passenger headlamp. We used our core support as a ground. The switch can be activated by completing 12-volts or completing a ground. The wiring for the switch was black, so for simplicity, we made the switch a ground. View Related Article
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