i am hooking up my underbody neons to my interior light in my car as the power source, so when i unlock my car they will go on. well, the dome light has a little current running through it already and my neons go on automatically. then when i unlock my car my dome light goes on. how can i wire this to the dome light and make my underbody neons go on when i unlock my car just like the dome light. thanks.