What you will want to do is install a universal wiring system like the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness with Install Kit # 119250KIT. This kit installs without cutting into your current wires.
You will simply locate the appropriate wire behind your tail lights housing using the included circuit tester and then clip in the correct wiring. A 12V power lead is ran to the battery itself to avoid damage to your 2002 Ford Thunderbid's electrical system.
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