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Why the brake lights on a trailer work after hooking it up to my 97 Ford Expedition with tow package?

The brake lights on your trailer work after hooking it up to your 1997 Ford Expedition because the tow package includes a wiring harness that connects to your vehicle's electrical system. This harness sends a signal to the trailer's brake lights whenever you apply your Expedition's brakes. The signal is typically a 12-volt circuit dedicated to the trailer's brake lights. The connection is usually made at a 7-pin or 4-pin connector on the rear of your Expedition.
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