There are a few ways you can have them turn on.
The first is you can integrate them into your dome lights using a relay or taping directly into them for the leds to light up when the door comes open.
The second is have a constant 12 volt source hooked up to the + and run the negative to the ground plug of the door switch. This will make the lights only come on when the door is open.
Also using a relay you can also add a 3 way switch and have the option to have them OFF-ON-DOOME LIGHT SWITCHED.
With a simple buy you have have them fade on and off. Will have to hunt that part down. SOME radio Shacks have them.
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