tap the power on the headlights, run a switch from the tap into the car, then back out to the lights. If you want them to come on with the lights, flip the switch on, then when using the button the lights will come on/go off depending on if their is power to the lights. When the switch is closed, headlights will operate like normal but no LED lights will run.
Be forewarned you will be viewed as a ricer with under body lighting on a mustang. Also be forewarned, it is illegal in almost every state to have any type of under body lighting on while the car is in motion.
2003 Redfire V6,
Show: Smoked everything, cobra front bumper, gt rear bumper, rear decklid and lower valence blackout with black mustang letters, 5% rear front 15%, black 98 Cobra rims front, 95 Cobra R rear black with chrome lip, black scoops and spoiler and exhaust tips
Go: CAI, True Duals with flowmaster super 44's, Bama Tune, full suspension (lowered, 8.8, 4.10s, UCA, LCA, springs, CC plates)