Try this. http://www.fordf150.net/howto/wire3rdlight.php

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03 RANGER EDGE 3.0
60/40 Seat Mod, Expo Full Console, Expo Mod Diff Cover, Thunderbolt Signal Mirrors, Flowmaster, Billet Grills, One Piece Halo Projector Headlights, HID Fogs w/Halos,
LED Lightbar, Euro Taillights, Interior Accents Painted, OHC, Indigo Cluster, 7" LCD Headunit, Mustang Dome Light, Manik Brush Guard
PNW CREW