Quoting PJGross:
Andrew,
In your actual picture isn't the amber plug just that, a plug. It isn't an receptacle with wire leads, correct?
That's what I was wondering what it is used for.
Since I'm replacing and messing with turn signals, which the LEDs I just got for them need a resistor for the turn signal to slow down, I was going to run a lead up to the corner amber to light that one up. I just need to find a few bulb holders with leads off of them that are a little longer than the ones in your picture. /ubbthreads/images/graemlins/smile.gif
-PJ
It's like your dash lights, there is a circuit internally that feeds power over to that socket. Also if you stop buying the cheap stuff, you wouldn't need to worry about a resistor for LED turn indicators.