I recently updated from a iPhone 4 and its Mophie to a iPhone 5S and a Mophie Helium. When I plug into my car stereo with the micro usb the new Mophie and phone charge fine but no longer send sound to the car stereo. I use to do this all the time with my iPhone 4 and its Mophie. Any advice? This may be a non-starter if I can't get this to work. Yes I did try multiple micro USB cables and the phone plays fine by itself with the lightning cable.