Hello, friends, can anyone help me out in installing led strip light inside my (chevry Spark) the boot space, i am little bit of confuse as I have got an constant 12+ line from my door sill plate but don't know from where should i take the negitive line, and one more thing if i want to install it like the dome light I mean like it light up where the boot is open and other time it remain off. Tell me both the way of installing it.......