Ok when i installed my shift light i discovered where the power source is. Above the dead pedal the green wire is where the shift light hooks up to the positive side. Today i bought some leds to wire in my vents, i tested to see if the leds worked, i put positive to green wire and black to grounding in the car. It worked but i dont understand how it works? I always though that stuff needed to be hooked up to positive and negative parts of the battery how does this work? Also it will only turn on when key is on. This is great but i just want to know how this works? Also can i keep wiring more stuff? I want to wire my interior glow to this when i buy it and a radar detector