i bought some blue 12v light bars to put inside my cab under my dash. i would like to wire them up to wear they come on whenever my park lights and headlights are on. i would also like to have them on whenever my doors open if thats possible? where would i get my power source from? the battery? lmc sells cool little battery taps now and their cheap so i might pick one of them up.

im new to wiring so sorry for all the questions guys.