I think if we use the switchback 7443 bulb and have the positive (+) wire of the white LED connect to the relay and tap the relay to the battery and the sensing circuit to the cigarette's fuse and get the power from there (since it always power on when you turn on your car). Another way we can do is to connect the 7443 bulb to the cigratette's fuse without the relay. That way we can have the 7443 bulb (white LED) on when we power up the car and still have the signal (amber LED) working. This is just my 2cent. Please correct me if I'm wrong.
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