If you want the dome light to stay on and gradually fade you can add a capacitor. I use my signal light in the front for my DRL so I used a 10,000 UF capacitor to keep my signal light on when I had my signal on. That capacitor kept the light on about the normal time a signal light i on. The capacitor is not large and if you needed something that could store more power to keep the light on longer they are available and they arn't expensive