I just figured out why my Scosche adapter would sometimes work and sometimes not work when I tried to use it to charge my iPhone 3G or 3Gs. On my car and Avid-D3 I have to plug in the phone before I turn the engine on. If I do that it always charges the iPhone. If I plug it in after the car is running it never works.
Bizarre, but man am I happy I finally figured it out.
Now if someone, anyone, could figure out how to get contacts onto the D3 and video to stream from the iPhone to the head unit's screen I would be eternally grateful.
Brian