My car is batman themed and saw some LED projectors for the doors to project the bat symbol onto the ground when you open the door. My dilemma is that I don't have any power wires running in the doors other than the speak wires. If I were to tap into those then the lights would always be on when the door is closed and key turned on. So I was thinking about tapping into the dome light wires since the light turns on when the doors open. Any idea how I could access the wires to the dome light?