When my phone connects to sync in my ford truck it automatically starts playing music on my iphone. This kills the battery. Autoplay on ther sync...

Here's the solution: change the input to "line in" instead of the iPhone. SYNC in your car will still connect to the phone but the autoplay will not start streaming your music. Every vehicle system will be different, but make sure that "line in" is selected under "media in" or "alt" or other similar inputs besides Sirius, FM, AM, CD, etc. This worked for a 2010 Lincoln MKZ with the Nav (touch screen). I was having the same problem until I selected "line in" instead of iPhone. Have your Ford dealer show you how to select "line in" for your particular vehicle or page through the radio controls part of the car's book. Whenever you do want to stream your music, just go back and select the iPhone as the media input. Yes, it is this simple!