How to tap into the dome light?
 

Hey I had these M3 Mirrors with LEDS on the side. I hooked up the white leds with the sidemarkers and theres another strip of blue leds i wanna hook up to the dome light to when the doors open the lights turn on. so i took the dome light out and everything. theres a black wire and black wire with a white stripe. i tap into the black wire with a stripe it gets a constant power if the dome light isnt in but when the light is in it doesnt get any power. any ideas? thanks!